No Wilkes, you've been a great help actually. I went to the VsPlanet site (
www.vsplanet.com) where there are also a lot of Roland XP/JV/XV users and my question was answered. Now to answer some of your questions.
1) The SC880 has three modes - [Tone], [Patch], [Performance]
The [Tone] mode is similar to the [Patch] mode on the XP. The cool thing is that unlike the XP, you don't need a ton of effects to make your sounds sound good.
The [Patch] mode is similar to the XP's [LAYER] mode in that you can set up to six tones to make a more complex [patch]. It's important to understand that here the "patches" sound like XP Layer performances. The remaining 28 parts (32-6) can be used to sequence data. So you can have one complex Patch and still use other tones
The [Performance] mode on the SC880 is like a [Single Performance] on the XP. However, you can assign all of the parts to any channel and trigger two sounds on one channel if you'd like.
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As for my XP problem, the internal keyboard can't be used to trigger both channels or more at once in [single] mode. I could do this by patching a MIDI cable from the [MIDI OUT] to the [MIDI In]. I'd have to turn all of the channels' [LOCAL]'s off so I don't get any doubled notes.
Why would two drum sets on one channel be more powerful than a super mapped kit? You HAVE to check out the SRJV80-10 Bass & Drun board. In [PATCH MODE] there are twenty kits tht are mapped similar to the rhythm set. The difference is, since you only have four waveforms to assign to differnt keys, WAVEFORM MENU samples are used, these single waveforms have differnt percussion sounds mapped at different keys.
Like the internal waveforms, Roland has sampled both Loud and Soft snare samples. In the patch kit, what they would do is use a velocity split to assign both tones to one key (D2, just like in a normal rhythm set). When you do flams and snare fills, the effect is UNBELIEVABLE! I am a drummer and the sound reproduced is beyond me. All becuase of the velocity split.
I COULD map those two waveforms to two different keys in a rhythm set, but then you lose the effect of going loud to soft on one key and programming all of a sudden becomes less intuitive. Anyway, in the patch mode, since a soft snare waveform and a loud snare waveform have been used, that leaves two more waveforms to be mapped. The first is the KICK and CYMBAL Menu and the second is the HI HAT MENU. That takes up all 4 tones, no room for the toms. That sucks.
In performance mode, if I could set two rhythm sets to the same channel, I could key range one of the two so only the toms would play and use the other channel for the rest of the drums since I can't have the whole drum set in one patch due to velocity/waveform usage reasons. The drum set becomes full, I have dynamic control and I can get great sounding tracks!
Alas though, this can't be done on the XP with out doing a MIDI loop as I just explained.
I know I babbled, but now you see why this was such an issue to me. I hope I answered your questions.
The Infamous EPU.