Archive of the former Yahoo!Groups mailing list: Korg Poly800/EX800 Users

I could rewrite the code to toggle between Poly and mono mode using
the Poly key. Another way might be to make the Poly key the selector
for Poly, Mono, Chord and Hold mode. Each time you press the poly key
would move you into the next mode. That would free up the chord and
hold buttons to be used for selecting global mode and extended
parameter entry modes (or other things if we decide to add more).

What do you all think?

I managed to finish the pitch "bending" part of the mono mode
portamento last night. Unfortunately, the results are not as good as I
had hoped for although I was not completely surprised at the result
that I got. The method I used to simulate portamento was to use pitch
bend (which is a true analog bend) to slide one semitone up or down to
track towards the new note. Once the bend has moved the TG half a
semitone, the DCO's are reprogrammed to change to the note above or
below while simultaneously the bend is reset back to zero. This would
give the portamento effect by ramping the bend a semi tone and quickly
switching DCO semitones.

Well it works, and it gave me great joy to hear it working, but alas,
resetting the bend is a little slow and you can clearly hear the
oscillator output has a little glitch each time that the semitone note
change occurs. I now need to determine if the glitch is caused by the
master clock being incapable of tracking the output of the DAC when a
square wave edge change occurs in the bend or if the DAC sample hold
circuit is too slow. If it's just the sample and hold then I may be
able to reduce the sample hold capacitor to improve the highest
possible rate of change. If it is due to the master clock not being
able to change frequencies fast then I think we might be out of luck.
So much so that the only way to get good portamento would be to build
a new master clock that was able to slide the full five octaves.

Mike.