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Occasional clipped/skipped samples

2 replies [Last post]
The_JinJ
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Joined: 09/13/2011

Hi

I have a small problem with my setup - I use external triggers through an Alesis DM5 connected via Midi USB to my laptop. Hydrogen picks up the Midi signals ok and triggers the appropriate samples. However, every so often a sample will clip or not play at all, then they play again as normal. It's not related to speed played at - you can do fast rolls etc and it keeps up fine...until the problem occurs.
I have tried playing with bufer size in Jack etc but still the same issue. Also checked that volume/gain was not too high as to cause clipping.

Setup is as follows
External trigger --> DM5 --> Midi USB --> Laptop

LUbuntu 11.04 Natty
Jack2 running in RT mode, frames 512, sample rate 44100, Periods 3
Hydrogen - audio system set to Jack, default kit loaded.

I'm not sure if it is a Hydrogen, Jack or even Midi setup problem.

Hope that made sense and if anyone has any suggestions it would be appreciated.

Cheers
Neil 

thijs
thijs's picture
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Joined: 04/20/2010

Hi Neil

are you experiencing this when you are playing along with hydrogen playing a song/pattern?  or is it also when hydrogen is not playing at all?

In my live setup i also have some issues with notes not being played or notes getting played 'on top of each other'.  When i get notes played on top of eachother it results in a clip since there are 2 samples played at the same time (at leaset that's what i think happens)

In my case however it's not about instruments that are triggered using midi pads (i only use the pads to controll hydrogen, not to trigger sounds)

grtz

Thijs

The_JinJ
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Joined: 09/13/2011

Thanks for the reply.

Hydrogen is not playing, using it purely to trigger samples. I can play multiple samples at once and at different speeds and it will only clip every so often. I thought it may have been a RAM issue but have now ruled this out so thinking it may be some limitation of the MIDI USB adapter (?)

Is it possible that a buffer is getting filled hence the missed sample as it catches up?

Initially I was using my laptop but have also tried on my desktop with 3GB RAM and it has exactly the same issue. Could be the DM5....hmmmm