Old 10-13-2019, 08:23 PM   #1
ndchong
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Default What does this mean?

Hi- Appreciate if someone can throw some light to what these means?

1) Top right of Reaper screen for audio device- [44.1khz 24bit WAV :2/2ch 192spls 9.9ms/9.9ms ASIO]

2) Botton left of the FX pop up screen- 0.4%/2.2% CPU 802/1152spls

What does these readings mean? Is it good or bad?

Thanks
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Old 10-13-2019, 08:38 PM   #2
cfillion
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44.1kHz is the sample rate: 44,100 samples per second (maximum frequency is half the sample rate)
24bit is the bit depth: each sample is represented as a 24-bit integer
WAV is the recording format: recording will create WAV files
2/2ch are the number of input/output channels
192spls is the block size (also called the buffer size): groups of 192 samples must be computed in under 4 milliseconds (192spls ÷ 44.1kHz)
9.9ms/9.9ms is the reported input/output latency
ASIO is the current audio system: what's used to communicate with the sound hardware

0.4%/2.2% is the CPU usage of the selected FX/all effects in the chain
802/1152spls is the compensated latency of the selected FX/all effects in the chain

Last edited by cfillion; 10-13-2019 at 09:05 PM.
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Old 10-13-2019, 09:07 PM   #3
ndchong
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9.9ms/9.9ms is the reported input/output latency
Is this a good latency?

0.4%/2.2% is the CPU usage of the selected FX/all effects in the chain
So 2% is pretty good?

802/1152spls is the compensated latency of the selected FX/all effects in the chain
Is this bad? Does it mean you want to achieve 1152/1152 for good latency?
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Old 10-14-2019, 06:48 AM   #4
Stella645
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1. The figure changes when you adjust your buffer size. If you can adjust lower and still play projects without glitching then do. If not then make the best of it.

2. Depends what plugs they are. I would not use these figures as any indicator of how good or bad your system is.

3. No you don't want to achieve that....the figures are single plug/plug in chain.
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Old 10-14-2019, 10:48 AM   #5
serr
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Quote:
Originally Posted by ndchong View Post
9.9ms/9.9ms is the reported input/output latency
Is this a good latency?
If you are performing playing through instrument plugins on the computer or mixing sound for a live stage, you need the sound coming out of the computer to be in "real time" with no perceivable lag. The human threshold for the minimum time you can get away with is 11ms.

So...

If you're doing live performance or live sound, a total round trip lag of 19.8ms (from your example with 9.9/9.9) would not be good enough to use. You might try soldiering through it but it will not be comfortable.

For live sound, you need an interface and computer that lets you run stable at a low enough block size to achieve < 11ms round trip latency.

If this is for post work on the other hand. Or you record any overdubs monitoring with a low latency mixer built into your audio interface. Then you should set that block size high (512 or 1024 samples) to save CPU for the plugins and mixing. Because you aren't listening to live sound here - only the output from the computer.
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