Yamaha DTXpress/DTXplorer/DTXtreme

Let's first try to rule out the things that are NOT causing your 
problem:

> Through headphones I cannot reproduce 
> the problem. Turned the self reject and reject to it's lowest 
> settings on the snare. Someone mentioned that the speaker could be 
> causing my pizeo to "feedback" causing the note to cancel once in a 
> while. 
The sound waves from a nearby speaker (if loud enough) could cause 
enough vibration to trigger the piezo. But it would have to be really 
loud & really close to send the piezo into feedback - where its 
vibration causes a trigger which is amplified and becomes added to 
the existing sound vibration. I've heard feedback many times and I 
don't think it's selective enough to cause dropouts every second bar.

> Another thought is the compressor in the JBL is cutting in...
A compressor is designed to reduce the gain of a signal after a 
certain time (attack), and only when the signal exceeds a certain 
threshold. The overall effect would be to flatten out the dynamics of 
your playing, rather than to specifically cut out entire sounds.

I'd be surprised if rejection settings were also able to cause such 
specific droupouts - but it would help to know what rock beat you are 
playing exactly, at what tempo and which beats are getting dropped?
Is it possible to upload a recording of this phenomenon?

G