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No, and yes...
No, in that you can't do it straight forwardly. But yes, you can hack (edit) a way around it, with the caveat that any additional drum timbres are each monophonic (they can play ANY drum sound, but only one at a time [per step]) as opposed to polyphonic (playing multiple drum sounds per every step).
Timo wrote:Firstly, one channel can be assigned as a normal drum kit timbre, which will be polyphonic.
The other three channels can each use the "Drum PCM" waveform setting on Oscillator 1. Bear in mind that using the "Control 2" knob on Oscillator 1 you can select between any drum sample from the 128 PCM drum samples at any one time. Now, it just so happens that the Modulation Sequencers can allow you to modulate the "Control 2" knob, so you can literally turn any such channel into a whole drum kit, albeit monophonic, by programming a modulation sequence to select different drum samples per step.
It means, not only do you have four drum channels at your disposal, each channel can access ANY of the 128 drum samples from the ROM on any step.
It's a bit like old-skool multiplexing using 'tracker' sequencers of yore (OctaMED, FastTracker, Renoise, etc.)
Don't worry if you didn't understand the last bit.