Using Cakewalk Sonar, I was able to get my DP-32 to control 8 channels of faders and pans. Since those 8 channels can be moved around the tracks, that does not appear to be a major limitation, since I usually only write a few tracks at a time in mixdown automation. For the control-surface definition, I have to use a Generic type, and the preset that seems to work best is Akai, but there is no Tascam preset. I'd like to find one! I know other DAWs do support Tascam surfaces.
Virtually every parameter on the DP-32 outputs MIDI data, and if you look at the MIDI implementation documentation, there is indeed MIDI control for everything. I'm going to attempt to go parameter-by-parameter and have the control-surface plugin learn as much as I can get it to learn.
Once I am better acquainted with how it all works, what I really want to do is to use the DAW to MIDI record Mixdown data from the DP-32 and to control the DP machine using MIDI for mixing in the DP machine and not on the computer.
I read that some have gotten 16 channels to work, but the max number I can get is 8. I believe that is because the DP-32 has 8 mono tracks. What I haven't tried yet, is changing stereo tracks to mono, which would give me 20 mono faders. I'll try a new blank song with all mono tracks and see how that works as a control-surface. I'll report back later.