Yamaha DTXpress/DTXplorer/DTXtreme

I also meant to ask-- I had mentioned that I adjusted R1 to make the rim switch more sensitive, but on edrum.for.free.fr it says to adjust R2 (for the piezo/piezo-to-piezo/switch circuit, not the two-mono-pad citcuit)...  Is there a difference, or is R1 just adjusting one side of the threshold, and R2 is adjusting the other so in effect it's the same thing?




--- In DTXpress@yahoogroups.com, "Keith" <keith@k...> wrote:

> 
> I have managed to get my hands on a Roland tom pad for a quick test. 
> While the polarity is negative, there is plenty of positive going
> signal as well.  However, if the Roland module only takes notice of
> the negative going signal, a diode as I have drawn it would be a bad idea.
> 
> Could you try something?  Fit both D1 and D2, but the opposite way
> round to my diagram!  This should give the isolation between the two
> piezos, still drive the transistor for the rim switch and allow the
> negative pulses through for the Roland module.
> 
> Keith.