I often create beats, riffs, and samples on the
MC-909, but sometimes it's hard to use them in a full composition without having a mouse and a large screen. To accomplish that, I arrange everything in
Ableton Live.
You can do that by tranferring either MIDI or Audio.
I use a M-Audio FireWire 410 as my soundcard and all connections. Connect all your audio output cables (SPDIF) from the 909 to your soundcard. Do the same for MIDI in/out.
For MIDI transfer and control, you need to use the 909 as the master sync, go to Menu -> System -> Seq/MIDI, and make sure Sync Mode is set to Master and sync output on.
In Live, go to Options -> Preferences -> MIDI Sync. Under the midi input section, make sure that you turn on Track, Sync, and Remote. This allows the 909 to send MIDI messages to each Live track, as well as sync timing and remote control through the 909.
Create 16 MIDI tracks in Live, one for each 909 MIDI track. Then, find the I/O section under the MIDI track info, set MIDI from to your MIDI source (mine is FW 410 MIDI), and underneath that, set the MIDI channel to 1. Make sure you do this for each track input, 2, 3, 4, etc. And no output (when recording in).
Try experimenting with recording each midi track. To record track 1, simply mute all other tracks on the 909 (Part mute -> Shift and track button 1), arm the track to record in live, click record for the MIDI slot, and play on the 909. Watch the midi notes roll in. Do the same for all the rest.
After you've recorded each midi track, you can turn off the MIDI inputs in Live, and then turn the MIDI out port to each corresponding track. In the 909, goto Menu -> MIDI -> MIDI Rx, and turn Remote Keyobard Switch to OFF. You'll need a blank pattern in the 909 with each patch that you used for sounds. Hit play to wach Live trigger notes on the 909.
So that's how you use Live as the midi source to trigger sounds on the 909. You can then edit and arrage midi on your computer.
To do the same for audio, simply change the source input for each track in Live from MIDI to your audio source such as the 909's SPDIF.
I also like to control Live from the 909. You can enter MIDI map mode by clicking the MIDI button in the top right of Live. Every configurable parameter through MIDI will turn a purple color. Click a sample for example, then a key on the 909, and you just configured it as a trigger. You can try experimenting with any knob that sends MIDI data as a control for Live. Just look in the very top right corner of Live at the MIDI Track In Indicator to see if the 909's knob is sending data.
It may sound complicated, but you've just got to try experimenting on your own to see how it all works together. Good luck!