Here is the manual if you don't have it:http://www2.yamaha.co.jp/manual/pdf/emi/english/ssdrums/dtxp4_en_om_d0.pdf The set comes with 427 drum/percussion voices and 22 keyboard voices. If you use a midi cable plugged into the midi out on the sound module you can control other midi sound modules and midi devices by plugging into the midi in on them. Page 30 of the manual describes some of the parameters. If this helps please let me know.
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