Zoom UAC-232 - 32 Bit float - USB Audio Interface - Review
Summary
TLDRこのビデオでは、ZoomのUAC-232インターフェースをレビューし、32ビットフロート録音機能の利点を探求します。UAC-232は、金属の足とプラスチック製のボディを持つ2チャネルオーディオインターフェースです。ダイヤルはスムーズで、出力とヘッドホンの音量を調整できますが、ヘッドホンジャックが近接しており操作が少し難しかったり、動的なレンジが非常に広いためゲインの調整が不要です。32ビットフロート録音は、ソフトウェアによっては完全にはサポートされていないものの、大きな動的レンジを確保し、クリッピングを回避できます。インターフェースは24ビットモードでも優れたパフォーマンスを発揮し、低ノイズアンプと高い出力ダイナミックレンジを持っていますが、ヘッドホン出力とビルドクオリティには改善の余地があります。
Takeaways
- 🎙️ ZoomのUAC-232インターフェースは32ビットフロート録音に対応しており、新しいトレンドを創出しているとされている。
- 🔊 UAC-232はデザインからすると従来の2チャネルオーディオインターフェースに似ており、金属の足と軽い重さ(360グラム)を持つ。
- 🔩 金属の足はマウンティングオプションやケーブルの固定に利用できるが、インターフェースがデスクにしっかりと固定されないという問題がある。
- 👍 ノブはスムーズに回転し、大きな出力ダイヤルとヘッドホン音量を個別に調整できる小さなダイヤルが前面に配置されている。
- 🔌 入力には2つのXLRおよびTRSコンボジャックがあり、マイクからラインレベルまでのものを録音できる。
- 💡 32ビットフロート録音モード時に青のステータスLEDが点灯し、インターフェースはそのモードで動作していることを示す。
- 🔄 UAC-232はAKMのAK-5534アナログデジタルコンバータを使い、4チャネルのストリームを2つのペアに分け、感度を切り替えながらシグナルをキャプチャする。
- 📊 周波数特性は非常に平坦で、聴覚範囲では非常に低い周波数まで良いパフォーマンスを示す。
- 🔊 ダイナミックレンジは非常に高く、136.5 dBに達するという驚くべき結果を記録している。
- 🔧 32ビットフロートはソフトウェアによっては完全には機能しないことがあり、録音フォーマットとしてまだ初期段階にあるとされる。
- 🎵 ミックスコントロールソフトウェアはインターフェースの機能を最大限に引き出すために必要なツールであり、録音レベルの設定やウェーブフォームプレビュー、ループバック録音、音楽モードとストリーミングモードの切り替え、レベルメーターが利用できる。
Q & A
32ビットフロートとはどのような技術ですか?
-32ビットフロートは、デジタルオーディオデータの記録方法の1つで、非常に広いダイナミックレンジを記録できます。これにより、録音時のゲイン調整が不要になり、録音後にソフトウェアでクリッピングを復旧することが可能です。
ZoomのUAC-232インターフェースの特徴は何ですか?
-UAC-232は32ビットフロート録音に対応し、非常に高いダイナミックレンジを持ち、ゲイン調整が不要な点が特徴です。また、金属の突起が付いておりケーブルの取り付けやマウンティングが可能で、プラグとダイヤルもスムーズに操作できます。
UAC-232のボディはどのような素材でできていますか?
-UAC-232のボディはプラスチック製で、全体的に軽い構造となっており、金属製のインターフェースと比べると若干安っぽい印象があります。
UAC-232のダイナミックレンジはどの程度ですか?
-UAC-232のダイナミックレンジは136.5 dBに達しており、他のインターフェースと比較しても非常に優れていると評価されています。
32ビットフロート録音がどのような利点がありますか?
-32ビットフロート録音では、入力レベルが0 dBFSを超過してもソフトウェアで音声を復旧できるため、録音時のゲイン調整を気にする必要がなくなります。
UAC-232のソフトウェアであるMix Controlにはどのような機能がありますか?
-Mix Controlでは、入力レベルの調整、ウェーブフォームのプレビュー、ループバック録音、音楽モードとストリーミングモードの切り替え、出力レベルメーターなどが利用できます。
32ビットフロート録音はどの程度普及していますか?
-32ビットフロート録音はまだ比較的初期段階にあり、すべてのソフトウェアやドライバーが完全に対応しているわけではありません。しかし、今後ますます普及すると予想されています。
UAC-232のヘッドホン出力の性能はどのようですか?
-ヘッドホン出力の周波数特性は良好で、出力レベルも十分に高く、ほとんどのヘッドホンを十分な音量で再生できますが、出力インピーダンスが高く、非常に低インピーダンスのヘッドホンでは最適な音質が得られません。
UAC-232のラインレベル入力の性能はどのようですか?
-ラインレベル入力の周波数特性は非常に平坦で、歪率も低いと評価されていますが、ダイナミックレンジはマイク入力と比べて若干低くなっています。
UAC-232を使用する際には注意しなければならない点はありますか?
-32ビットフロートを使用する際には、ソフトウェアやドライバーとの互換性を事前に確認する必要があります。また、インターフェース自体にはゲインダイアルがなく、録音レベルの調整はミックスコントロールソフトウェアで行う必要があります。
Outlines
🎙️ UIC-232インターフェースの紹介と32ビットフロート機能
この段落では、ZoomのUIC-232インターフェースとその32ビットフロート録音機能について紹介されています。UIC-232は金属の角材とプラスティック製の軽量ボディーを持つデザインで、組み込み済みのアンプとケーブル固定オプションがありますが、デスクの安定性には若干課題があると指摘されています。インターフェースはダイヤルやボタンが付いており、32ビットフロート録音モードが有効かどうかを青いステータスLEDで確認できます。内部にはAKMの4チャンネルADCが使用されており、デュアルADCのセットアップにより広範囲のダイナミックレンジを捉えることができると推測されています。
🔊 UIC-232のオーディオパフォーマンスと32ビットフロートの利点
段落2ではUIC-232のオーディオパフォーマンスと32ビットフロート録音の利点について詳述されています。UIC-232は2つのADCを組み合わせることで非常に広いダイナミックレンジを提供し、ゲインの調整が不要になるという革新的な機能を持ちます。しかしながら、32ビットフロートはソフトウェアとドライバーの互換性の問題があり、OBSやDiscordなどではまだ完全に対応していないと報告されています。また、32ビットフロートが完全に機能するのは特定の環境下のみで、他のアプリケーションではクリップした音声を回復できない可能性があることも指摘されています。
👂 UIC-232のヘッドホン出力とミキサーソフトウェアの機能
この段落ではUIC-232のヘッドホン出力とミキサーソフトウェアの機能について説明されています。ヘッドホン出力は周波数特性が良好で、ノイズレベルも低く、駆動力も十分に強いと評価されていますが、ヘッドホンのインピーダンスに依存する周波数特性の変化には注意が必要なと指摘されています。付属のミキサーソフトウェアでは、入力レベルの調整、ウェーブフォームプレビュー、ループバック録音、音楽モードとストリーミングモードの切り替え、出力レベルメーターなどが利用できます。
📊 UIC-232の評価と推奨
最後の段落ではUIC-232の総括的な評価と推奨について語られています。32ビットフロート録音はまだ完全には普及していないものの、UIC-232はデュアルADCによって実現された広いダイナミックレンジと、24ビットモードでも非常に優れたオーディオパフォーマンスを提供していると述べています。ただし、ゲインダイアルの欠如やヘッドホン出力のインピーダンスの問題、プラスティック製ボディーの品質感などのいくつかの欠点も指摘されています。最終的には、32ビットフロートのサポートが向上する見込みがあると期待しており、その場合UIC-232はより魅力的な選択肢になると結論付けています。
Mindmap
Keywords
💡32ビットフロート
💡ダイナミックレンジ
💡ゲイン
💡インターフェース
💡ADC(アナログデジタルコンバータ)
💡サンプリングレート
💡バッファサイズ
💡ループバック
💡ミキシングモード
💡入力レベルスライダー
Highlights
32-bit float recording is becoming a trend, with Zoom's UAC-232 interface leading the way.
The UAC-232 interface allows for automatic gain adjustment, eliminating the need for manual gain setting.
The interface features a classic 2 Channel audio interface design with metal rods for mounting and cable management.
Build quality is light due to the plastic housing, contrasting with heavier metal-cased interfaces.
Smooth dials on the front control output and headphone volume, with a minor design flaw regarding the proximity to the headphone port.
Direct monitoring feature with adjustable amount in software, enhancing user control.
Independent phantom power buttons for mic inputs and a switch for line/guitar input levels.
Blue status LED indicates when the interface is in 32-bit float recording mode.
Use of an AKM AK-5534 4 channel converter suggests a unique approach to capturing a wide dynamic range.
The UAC-232 has an impressive dynamic range of 136.5 dB, outperforming other interfaces.
No audible artifacts when switching between high and low sensitivity ranges of the ADC.
Potential issue with strong ultrasonic signals impacting the signal-to-noise ratio in the audible range.
32-bit float recording is advantageous for storing signals that exceed 0 dBFS without clipping.
32-bit float functionality is currently limited by software and driver support on different platforms.
Mix Control software is essential for setting input levels and accessing full functionality of the interface.
Round trip latency (RTL) performance is acceptable but not the best, with better times at higher sample rates.
The UAC-232 offers a decent audio performance with low-noise preamps and good dynamic range, despite some limitations.
The interface is a promising step towards new era recording with automatic gain and 32-bit float capabilities, but has some growing pains.
Transcripts
32-bit float seems to be all the Rave
right now and zoom is likely one of the
companies responsible for this new trend
with their recorders and now the uac-232
interface with 32-bit float recording
but do you really don't have to set your
gain anymore and is this the beginning
of a new era let's find out hey Julian
cross here and in this review I'll talk
about my experiences with the UIC 232
have a closer look at the audio
performance and of course the 32-bit
float operation which is quite
interesting in multiple ways full
disclaimer I bought the USC 232 with the
help of my awesome patrons shout out to
these absolute Legends other than that
this video has not been sponsored in any
shape or form let's have a look at the
interface itself before we dive deeper
into the audio topics from a design
point to the 232 resembles a pretty
classic 2 Channel audio interface in a
squarish box two things stand out right
away first of all the metal rods on each
Corner which can be used for mounting
options for the interface or help to tie
down cables one thing thing I've noticed
though is that the rubber pads are round
on these rods and because of that the
interface does not firmly sit on the
desk but tends to slightly roll around
from side to side not a huge deal but I
would have preferred this to be more
stable the second thing I noticed is the
build quality the 232 is quite light at
360 grams that's the weight of a three
to four month old Hedgehog for all the
Americans here but that's because the
whole housing is made out of plastic it
is still relatively robust but it just
it doesn't compare two interfaces with
the metal housing like for example a
focusrite 2i2 the knobs are also plastic
as well so as a whole the interface does
feel a bit on the cheaper side the dials
are smooth to return though so that's
great speaking of dials on the front you
get a big output dial which adjusts the
output volume of the main outputs the
smaller dial controls the headphone
volume independently my only complaint
is that the dial is a bit close to the
quarter inch headphone Port below and
with a big head jack inserted it can
make the adjustment of the volume a bit
trickier a few more millimeters distance
between the part and the dial wouldn't
have hurt on the front you can also find
four buttons one to turn on Direct
monitoring which is quite nice and you
can even dial in the exact amount in the
software which I will get to later two
phantom power buttons which individually
toggle 48 Volts for the mic inputs and
the button which targets the first TRS
input between a line level or a high Z
guitar input in terms of inputs you get
two XLR and TRS combo inputs which can
record anything from mic to line level
and if you weren't sure that this
interface is capable of recording in
32-bit float well it always reminds you
with this blue status LED which is
turned on when the interface is in
32-bit float recording mode switching to
the back you can find the aforementioned
TRS main outputs to connect your studio
monitors there's also a set of midi in
and output connections a kensing locking
point and two USB C ports one is to
connect the interface to a PC and in
most situations this handles the data
connection and simultaneously delivers
power but in case you use a mobile
device that doesn't deliver enough power
via USB then you can power the interface
with for example a power bank via the
second Port now it would be a shame if
somebody were to open the interface and
reveal the 32-bit float magic so I'm not
going to as you can see the UIC 232 uses
an akm ak-5534 analog to digital
converter which is actually a 4 channel
converter and here's how I think that
works this is pure speculation and I
have no idea if this is totally correct
so take this with a big grain of salt I
think Zoom is capturing all four streams
of the ADC and have the adcs set up in
pairs so that you have one as high
sensitivity and one that has a low
sensitivity and then switch between them
depending on the signal strength and
this is likely done by the arm
microcontroller if that's completely
over your head you can watch my dual ADC
explanation video but in the end all
that it means is that the 232 is merging
the dynamic range of two analog to
digital converters and thus can cap
capture a huge range of signals which is
why you don't have to set your gain
anymore with this interface it simply
captures all the signals coming from the
microphone doesn't matter how soft or
strong okay enough about that let's
check out the audio performance starting
with the mic inputs first up here is the
frequency response which should be as
flat as possible to record all
frequencies equally well you can see
that the frequency response is very flat
in the audible range and it only rolls
off at very low frequencies but that's
below the human hearing range and that
can actually help to avoid infrasonic
Rumble in your recordings all good here
next up is dynamic range which is the
ratio of the strongest signal that the
interface can capture and its noise
floor and this is where it gets Mighty
impressive the zoom UAC 232 comes in at
136.5 DBA I actually had to change the
scale of my comparison chart because it
never went that high the 232 easily
beats all other interfaces by an
additional 14 Bots that's pretty crazy
of course keep in mind that this is the
result of merging the signal of two adcs
which is obviously beating a single ADC
solution and there are definitely some
downsides to the switching which we will
talk about in a second still this is
something that hasn't been done like
this before at least not in this price
range and I think that's very exciting
so in practice this means that the UIC
232 can capture incredibly small but
also incredibly strong signals without
any need of adjusting the gain in fact
there is no gain dial on the interface
the only thing you get is an input level
slider in the mix Control software the
important part here is that this is
digital amplification which only takes
place after the signal has already been
captured there is no analog gain control
on this interface a positive thing I
want to mention here is that Zoom seems
to have done their homework as I've done
multiple tests with a specifically
created test signals which forced at the
ADC to toggle between the high and low
range range and I could not hear any
artifacts in the transition that's great
because in normal use I do not expect
the switching between the adcs to be
audible I mean that's what you would
expect but nevertheless it's great to
see that this holds true in practice one
downside of the switching behavior is
that any signal in the adc's frequency
range seems to toggle the switching once
it surpasses a certain threshold this
means that a theoretically a strong
signal in the ultrasonic range could
cause the ADC to toggle till the lower
sensitivity one which would negatively
impact the signal to noise ratio in the
audible range this is a very rare
scenario but I would have wished that
its signals that are above half the
sample rate would not be able to toggle
the switching of the adcs additionally
some adcs tend to have a rise in the
ultrasonic noise and this also holds
true for the 232 when the ADC switches
ranges a thin noise arises noticeably in
the ultrasonic range and this noise
modulation might become audible when you
pitch down ultrasonic frequencies into
the audible range again this is
definitely more of an edge case but for
recording ultrasonic stuff the 232 might
not necessarily be the best option
notice that I haven't mentioned the
third YouTube with float mode so far and
in fact the incredibly huge dynamic
range of the 232 can still be fully
contained in 24 bits so you might ask
yourself the question what's the benefit
of the dubit float then it has to do
with how the signal is stored
historically 16 and 24 bit integer
formats don't support values above zero
dbfs so they clip the signal while the
32-bit float retains this information if
you turn up the input level in the mix
control the signal you record gets
Amplified and here is the point where
you can clip when using 24-bit mode so
that's where you still have to be
careful to set your input level properly
to not clip if you're in 30 with float
this does not matter because even if the
signal goes above zero dbfs you can
still pull it down and post so even in
24 bit mode you benefit from the Dual
IDC setup and the huge dynamic range and
theoretically you could just leave your
input level at zero and then set your
level and post with a third two-bit
float you have the additional benefit
that you can bring the signal level up
to a typical recording level and even if
it were to clip you can simply restore
it but there's a big catch in my testing
I found that the 32-bit float was only
fully functional with the azio drive on
Windows and I think this is important to
mention because only because the
interface shows a nice 32-bit float
indicator you could still be clipping in
an application where you can't recover
the audio OBS and Discord are still
clipped at a 0 dbfs maybe there will be
a future update but at the time of
making this video 32-bit float did not
prevent clipping in these applications
so the best thing to do is actually to
make a quick test of clipping and then
pulling down the signal to see if you
can restore it I am not an Apple user so
I can only tell you about windows but it
seems that at the point of making this
review there is no application that
supports a 32-bit float via the standard
mme or vasapi driver when I was using
azio the 32-bit float worked fine with
for example Adobe Audition but without
azio if for example in audition the
audio was not recoverable when going
above 0 dbfs despite being in the 32-bit
float mode on the uic232 I think there's
a very good chance that this will be
updated in the future and I imagine that
there will be more and more 32-bit float
adoption but you have to be aware that
depending on the application you use and
also on the driver 32-bit float might or
might not always work as intended you
have been warned Zoom actually has a
table showing different software and
indicating whether it supports a 32-bit
float recording and if the audio above
0dbfs is recoverable I think they should
also mention the driver there because as
I mentioned before it can make a
difference if if you use azio on Windows
or the Windows standard driver
if azio is available that's definitely
the preferred option not only because of
the 32-bit float what would be really
cool is if there were a 24-bit limiter
mode which would behave like a normal 24
bit interface but when you go above zero
of dvfs the interface deploys the
digital limiter to keep this signal in
range this way you could use the
interface like any other and with all
applications but make use of the
incredibly High dynamic range to prevent
clipping that would be really useful in
for example streaming situations where
you want your signal to sit at a decent
level but you also do not want to blow
out people's ears when you suddenly get
a bit louder so if you're watching you
know what you have to do I know the
whole 32-bit float thing can be a bit
confusing but in one of my next videos I
will explain it in more detail and
you'll see that it is quite easy to
understand subscribe if you don't want
to miss that video besides dynamic range
the preamp performance is quite
important especially if you use Dynamic
microphones as an example for worst case
scenario here I have connected the
infamously low sensitivity issue sm7b
directly to the UIC 232 and I'll be
quiet for a second so you can have a
listen to the nozzle of this setup
great to hear that this is a pretty low
noise floor I was a bit afraid as the
last two Zoom interfaces I reviewed
didn't fare too well in this test but
the USC 232 has a very respectable
preamp noise of
-128.3 DBA weighted which is right in
line with other interfaces in its price
range have a listen
the preempt noise of the 232 is
definitely low enough that you do not
need an additional inline preamp and
because the input level slider can
provide you with an additional 60
decibels of amplification you will have
no problem bringing even low sensitive
mics up to a proper recording level
lastly here's the Distortion graph with
a typical mic signal and you can see
exactly where the 232 switches ADC
ranges generally we see a downwards
Trend which is exactly what we would
like to see and only in an audible
amount of distortion is creeping in just
before the input Clips but Julian the
232 cannot clip wrong at some point even
the 232 will clip this point is so high
that under normal circumstances you will
never hit this level but technically the
input can and will clip at some point
now I don't want to bore you with the
line level input performance because it
is very similar to the mic inputs the
frequency response is very flat there is
only an Ever So slight hump around 25
Hertz but this is really not something
you can hear the THD plus n looks quite
special once again you can see where the
interface switches between the adcs but
on average distortions are at or below
minus 80 decibels and this should be
inaudible the dynamic range is slightly
lower compared to the mic inputs but
still higher than anything else I've
ever measured before all in all no
surprises here before we check out the
software let me quickly show you the
performance of the main output in the
headphone output the frequency response
of the main output is perfectly flat and
the audible range so that's great the
dynamic range of the output is quite
good with about 113 DBA but it didn't
quite make it into the excellent
category still I would say that for the
most part this is very good and you
shouldn't hear any noise from your
studio monitors with this interface the
Distortion performance is decent I have
definitely seen better ones but you can
see where the line levels out and that
Distortion components sit -90 decibels
below the test signal which in my
opinion is not audible also nice to see
that the 232 delivers quite a nicer
signal strength of about 16 gbv which
should bring any studio monitor to a
very loud level as always I have made
multiple measurements of the headphone
output and you can compare them all here
in this colorful mess I'm not going to
go through all of the measurements but
let's have a look at the ones that stick
out while not directly Apparent from
these numbers you can see that the
frequency response of the headphone
output depends quite a bit on the
impedance of the headphones with lone
pins headphones the roll off in the
lower frequencies is quite a bit more
pronounced and while I don't think that
this is extremely apparent on playback
it could have definitely been more flat
and less dependent on the headphones
impedance Additionally the output
impedance is on the higher side that
means that the frequency response of
your headphones could change even more
depending on their impedance because of
that I would avoid using very low
impedance headphones or iems with 16
ohms or so and would go at least with 32
ohms and higher if sound accuracy is
important for you besides that the
headphone output has quite a bit of
power and you should be able to drive
most headphones to loud listening levels
THD and the noise levels are also quite
good and you shouldn't perceive any
noise or Distortion with the headphone
output all in all not a high-end
performance but a definitely a decent
headphone output quality especially if
you use High ampens headphones as
promised let's check out the software
that comes with the UAC 232 because it
is pretty much mandatory to use to get
the most out of the interface first up
here is the driver control panel which
gives you access to the buffer size
sample rate and format the latter one is
where you can switch between 24-bit or
32-bit float operation this is
straightforward but to get the full
functionality of the 232 you also need
to install mix control here you can set
the aforementioned input level and you
also have a waveform preview which gives
you a very basic glimpse of what you're
recording the software also provides the
loopback which allows you to record the
audio that is output by the interface in
addition to the inputs then there's a
switch which toggles between music and
streaming mode in musical mode the
inputs are recorded as separate tracks
and you can individually set the level
of direct monitoring for each Channel
and pen with the knobs above streaming
mode combines at the left and right
channel into one mix and with the diets
you can now control how much of each
Channel contributes to the overall mix
this can also be useful in communication
software which doesn't see the second
input of the interface in music mode but
if you're in streaming mode both inputs
get sent to the software and can be
heard by other people last but not least
you also have a level meter for your
outputs which you can use to gauge your
output level that you're listening to I
think the mix control is quite a useful
tool but it does of course not provide
more elaborate mixing or routing
functionality like in bigger interfaces
then again with the two channel
interface that's probably not often
needed I also checked the round trip
latency which is specifically
interesting for people who want to
monitor the audio in real time with
effects applied here you can see the RTL
with 48 kilohertz and different buffer
sizes it's definitely not the worst but
it's also not the best times I've
measured when you record with a higher
sample rate the rtls get slightly better
and even more competitive although it
could still have been a bit better I
think the RTL performance is acceptable
but nothing special alright verdict time
is this the future of audio recording do
you just plug in your microphone and
never have to worry about gain again
well kind of but we're not quite there
yet the UIC 232 does pretty much what
Zoom is advertising and that's recording
an insane dynamic range which pretty
much captures all the audio from your
microphone and because of that there is
really no need to set the gain anymore
and with the 32-bit float recording mode
you can recover audio that has been
clipped in software now the issue is
that 32-bit float is not universally
supported by all software it is of
course not the fault of the interface
but you have to keep in mind that at the
point of making this video we are still
in a relatively early stage of 32-bit
float at least when it comes to it as a
recording format and the reality is that
there is a lot of software and Driver
combinations that don't fully work with
a 32-bit float yet some programs might
not work with 32-bit float at all while
other programs let you record in it but
then don't retain the audio information
above 0 dbfs which can lead to a very
unpleasant surprise so if you plan to
use the interface in 32-bit float I
highly recommend that you make a test
first where you clip on purpose and then
see if you can recover the audio just to
make sure that everything works on
Windows use azio wherever you can
because this seems to work most reliably
without float when it works the 32-bit
float recording is a pretty handy thing
to have you essentially record like
always but you have the possibility to
restore your signal if you ever go above
zero dbfs so there are definitely still
some quirks that have to be ironed out
before I can confidently recommend a
32-bit float interfaces that said in the
UIC 232 still benefits from its dual ADC
conversion and if you set it to the
24-bit mode you can still capture an
insanely huge dynamic range and that's
already supported in pretty much any
audio software today just be aware that
if you buy this mainly as a 24-bit
interface it does not have any gain
dials and you will need to either set
your recording level in the mix Control
software or you will have to verify the
recording to the desired volume and post
besides the Dual ADC and a 32-bit float
the UIC 232 overall delivers a decent
audio performance similar to other
interfaces in its price range the
preamps are very low noise the dynamic
range of the outputs is good only the
headphone output and pins could have
been a bit better and the build quality
a bit less plasticky okay that's it for
now please give this video a thumbs up
and subscribe for more content and I
will see you all in the next one
foreign
[Music]
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