Hi, you need a USB interface as provided by Edirol, Tascam, M-Audio etc.
These have a 1/4 jack, 3-pin microphone or midi inputs from your music device, and the unit has a USB connection to connect to your PC. In your case with the TD9, you can record via the audio inputs (stereo) or midi.
Try:
Edirol UA-25EX
Tascam US-122
M-Audio Fast Track Mark II
EMU 0202
Cheers
Davo