Yamaha DTXpress/DTXplorer/DTXtreme

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

It was getting late last night and I forgot about the real reason for
D2 - to stop one pad loading the other.  Without it, the signal from
the pad with D1 will be halved due to the load from the other pad.  I
will try to get hold of a Roland pad to test, but I think it sounds
like the polarity is different.  Certainly some of the Yamaha pads
have very little negative going pulse (e.g. the kick pad, from memory)
due to the lack of mechanical resonance and high damping.  If this is
the case with the Roland pads, but negative going, the circuit will
only work well with the pad polarity reversed, but then this will not
drive the Roland module well if it is expecting negative going pulses.

If I can get hold of a Roland pad I will check and may be able to
devise a different cirucit for Rolands.

Keith.