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alexmacrae / SamplerBox_backup

SamplerBox is a sampler instrument based on Raspberry Pi.
http://samplerbox.org
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Latency too big #1

Closed paul-at closed 7 years ago

paul-at commented 7 years ago

http://www.samplerbox.org/forum/304 I measured ~80ms as well

alexmacrae commented 7 years ago

@paul-at is this when using the on-board DAC (bcm2835)? I too have not been able to get much lower than 80ms without compromising quality using the RPi3's on-board audio. In modules/sound.py I force sounddevice's latency to to be high: https://github.com/alexmacrae/SamplerBox/blob/master/modules/sound.py#L361

When using one of my other external USB DACs I can get <15ms (the script reports ~8ms, but I'd say it's a bit more than that) because sounddevice is able to use the latency='low' option. Tested with a USB DAC PCM2704, Focusrite Scarlett 2i2, and PreSonus AudioBox iOne.

paul-at commented 7 years ago

I define latency as time between end of MIDI message and start of sound playing using our board I2S DAC. I use serial MIDI for this measurement because its easier to capture and there is less space for variability of results.

I just redone the measurement using RPi3 and 'official' SamplerBox code and its about 60ms.

However, don't know how you achieved it, but when I do same measurement using latest commit of your fork its only 8ms!! I think we can safely close this issue and post details on the website.

Here's a proof: ds1z_quickprint1