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Thanks!

:-)

Very interesting to read about the Xpander. The seperate outputs and CV/gate pr. voice input is very intriguing for me. I can see a lot of uses for that in my modular setup, as well as an extension for my minimoog. And of course for great polyphonic chords. I already have a MIDI master keyboard and one of those Roland CV keyboards, and I am building myself a polyphonic MICI-CV controller, so the possible uses are endless.

Having a master keyboard with an arpeggiator seems like a good idea. I mostly rely on analog step sequencers, and since they can interface directly with the Xpander, that would be a lot of creative fun. Two of the moog modular sequencers equals 6 rows of notes, the same as the Xpander inputs. Seems to be a perfect match!

Also have in mind,- exactly like w/ a Matrix-12, in Multi-Patch Mode, theres the option die fine which voicees will be triggered by CV/Gate and which over MIDI.
So, cable connections can be permanent and you decide by creating patches.

As a polyphonic MIDI CV/ interface,- I use the trusty vintage Roland MPU-101 which never failed here since I buyed it new,- but 4 voices only.

I see the occasional Xpander for sale here and there, but noticed in several ads a reference to various versions of the Xpander.

US and japanese versions.
There were also early US versions w/ a 24dB low pass filter only and later ones were w/ multi moder filter.
Id say most US XPanders are w/ multimode filters.

BEWARE of the japanese models,- completely differen PSU and voice board design,- not reliable units !

I tried to find more info regarding this, but all I could find was details about different versions of the internal ROM chips for voices, cassette interface and frontpanel (?) It may be that the various "versions" they are refering to are 110V and 220V versions, or are Japanese, European and American Xpanders different? It seems to be the same voice cards on all of them.

See above.
ROM chip version can be upgraded to the very last versions if you have a Eprom burner handling the Eproms used in the Matrix-12/Xpander.
The images are still available.

One last question: is there a monophonic alternative on the Matrix-12, where all 24 VCOs are played monophonically in unison?

Well, each patch used in a slot of a Multi Patch can be set to unison/mono,- so its practically 6 monophonic synths in a Xpander.
These "synths" together can be played in unison on the smae MIDI channel too in a multi patch,- or each one monophonic on different MIDI channels,- or any mix of key assignment modes.
The kay assignement modes in multi patch mode are similar to the old 4 - an 8-voice Oberheims composed from SEM modules.
With the Matrix-12 you have the detune page, w/ the Xpander you wont.
Theres the workaround copying the same patch to different single-patch memory slots and fine-tune the OSCs differently, then store again.
Then, if you put em into multi patch slots and set em to unison,- thats it for all 6 voices in the Xpander in munison/mono and detuned.

I dont know what the difference w/ the Matrix-12 and the 2nd voice board is though ...

Terje

PeWe