wiring pads for future positional sensing?

[dmitri]

Can this reversion - maybe at some point - be achieved with a setting in the MD interface as well? I'd think most people have pads that are wired in the Roland way.

No.

[userfriendly]

Can this reversion - maybe at some point - be achieved with a setting in the MD interface as well? I'd think most people have pads that are wired in the Roland way.

No.

Aww. Would it be possible to put some little electronics magic in between trigger and MD, then, which does the reversion?

[Ken Forgettable]

Can this reversion - maybe at some point - be achieved with a setting in the MD interface as well?

Head deflection bends the piezo to generate a signal. Roland wiring reverses the sign of the signal so when the head is hit and goes down the signal now goes up. The width of this first peak is used for positional sensing (I say 'is' rather than 'can be' because it's shorter

As Megadrum discards the negative parts of the signal 'reversion' is not really doable by the firmware.

If you think about it, Roland wiring should give better latency too - KISS!

[kurtus420]

Looks like I need to wire my pads the roland way, thanks for all the responses guys, this is all making sense now.
Dmitri, what did you mean by wiring them reverse to Roland? Or did you mean to reverse wire the head piezo like Roland?

[dmitri]

Wire them for Alesis as shown in the diagram.

[kurtus420]

Thank you for clearing this up dmitri.

[userfriendly]

In other words, people with pads that are wired the Roland way are utterly SOL with this?

Or, as I asked above, can this be remedied in hardware, say, with a little phase inversion circuit or similar?

[kurtus420]

I'm sure you can use a some kind of a dpst switch (I think) and cross wire it or you could cut the end off of a trs 1/4 cable and put a new male end on it wired correctly or you could just cut the trs cable and rewire it with a splice.

ps, I remember seeing a phase switch(i think) on dmitri's 32 input megadrum for his hihat pedal in the documentation section, I'm sure the wiring would be the same as whats required here

[userfriendly]

I'm sure you can use a some kind of a dpst switch (I think) and cross wire it or you could cut the end off of a trs 1/4 cable and put a new male end on it wired correctly or you could just cut the trs cable and rewire it with a splice.

ps, I remember seeing a phase switch(i think) on dmitri's 32 input megadrum for his hihat pedal in the documentation section, I'm sure the wiring would be the same as whats required here

Right. I'd just need to switch wires. man... I iz SMRT. Not!

[dmitri]

In other words, people with pads that are wired the Roland way are utterly SOL with this?

Or, as I asked above, can this be remedied in hardware, say, with a little phase inversion circuit or similar?

Positional sensing is not even there yet. For anything else piezo polarity doesn't matter.
If you still want to invert, in http://en.wikipedia.org/wiki/Operational_amplifier see "Inverting amplifier" and keep in mind you will need +/- power supply for this. Is it simpler than reversing polarity on a piezo?