Yamaha DTXpress/DTXplorer/DTXtreme

--- In DTXpress@yahoogroups.com, "emf" <liberatusvirus@y...> wrote:
> --- In DTXpress@yahoogroups.com, "Keith" <keith@k...> wrote:
> > Thanks, I thought someone had actually measured it, but it may have
> > just been a subjective "microseconds" I remember.  I will have to
> > experiment or get the oscilloscope and signal generator moved into 
> the
> > drum room and measure it.  I suspect I will need to close the switch
> > just before the piezo which means I will need to delay the piezo
> > signal slightly from the pad being used as a rim input.  One strange
> > thing I noticed is that if you hold the rim switch closed it 
> ignores it!
> 
> Keep us informed. You will become a very popular guy (not to say that 
> you aren't now) if you succeed. 
> 
> Ed

If anyone is interested (probably only me), the rim switch closes
around 1ms before the piezo wakes up, and the rim switch can pretty
much have returned to the normal postion by the time the piezo signal
is a significant size depending on how hard you hit it.  Either way, I
will need a delay on the rim piezo of around 2ms so I can switch the
rim before the piezo signal.  The piezo signal rings for around 30ms
at around 250Hz after being hit.  If anyone wants to see I can put the
waveforms in the file section.

I can see that a little box would be a good idea - there seem to be a
lot of unused "stereo" inputs which would allow the addition of extra
pads without a new DTXpress box.  Even the kick drum has a rim pad!

Must do some work now, will try to do the design later this week.

Keith.