Hi Claude,

The SD4 is actually TWO SD2's in one box. It also has a numeric keypad and 12 other buttons with a small readout on the front panel such that the user can choose patches and effects from its front panel.

There are indeed two different inputs on the back for the two different SD2 engines. Same patches as the SD2, incidentally. I haven't much use for the Live Drums feature, being a BIAB and RB user (grin).

The SD4 was obviously designed for the MIDI player who uses it mostly for Live Performance applications, I think. One channel and synth for playing back MIDI sequences from a laptop and the other one for their "Solo" synth which is hooked to their MIDI instrument.

I don't think you are missing a thing using the SD2 with BIAB and other pgmusic products, etc.

*The same SD2 patchmap works exactly the same with the SD4 inside BIAB or PT. Calls the same patches.

Hope this helps,


--Mac