Crackly distortion when I play multiple notes?

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Peanut posted Jan 15, 01:31:

I’m using SamplerBox on a Raspberry Pi 3 But whether I use the built in audio or a USB DAC I still get weird crackles/distortion when I play more than one note at once. I’ve tried messing around with the volume settings, which alleviates the problem a little bit, but the fact that it happens more prevalently with multiple notes is making me wonder whether it’s a performance issue rather than an audio issue.

I tested this theory somewhat by using a class 10 SD card instead, but the problem persisted. Before I try my next theory and try a better USB sound card, I’m wondering if anyone else has had this problem or could suggest what might be going wrong here?

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HansEhv posted Jan 15, 10:34:

The volume of the wav's is too high, so the sound is distorted before the volume adaptions you tried come in.
Either use a sound editor to normalize them to at least half or 1/3 of the volume or reduce the input volume via %gain of %%gain (if you use an image that supports those parameters).

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Peanut posted yesterday, 00:28:

Thanks, I'll try that. Hopefully after reducing that volume I'll be able to increase the master volume in order to not have it be too quiet for my headphones... Is this usually the case with all of the samples provided on the SamplerBox website? What's the best place to find properly normalised samples??

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Georg Vietor posted 17 min ago:

Hi, I have experienced the same. After having installed all the bits and pieces, and now that SamplerBox is running on my RB 3B+ I also wonder why there is the distorted sound. If I play all the 12 wave-files e.g. from Chorus Key on my Mac/Digital Performer at the same time there is a clean and un-distorted sound. Loading the wave files into an audio editor (DSP-Quattro) shows that the files are already normalized.

What I experience is that if I have a strong attack on my keyboard then there is this distortion. If I softly push the keys then the sound is clean. This suggests to me this is a velocity issue.

Any idea/comment?

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