This might also be useful. I'm planning on installing one in a tascam I just got working.
http://casperelectronics.com/motor-speed-mod/

All I need now is an Alex Mauer comment for the trifecta!

You kind of get these moments all of the time on the forums.

I'll probably end up bending one of the other ones too,  instead of opening this one up again... I'll have to go a little more in depth to find the feedback mod and I'll probably add a simple rc lowpass filter  too.

(Brother Android,  another one of my favorite chip artists!)

It's about as simple as they get!  I actually have 3 of these now,  you can't really bounce tracks on them without at least 2...

oooo that's a cute 4-track

Flip that shit

I tried connecting the input to the output with a pot...but without flipping over the pcb it's sort of hard to tell what's what...

Have you tried routing the output back to the preamp input? You might want to bypass the preamp, and go straight back to the amp.

So,  after opening it up and tinkering around a little bit,  I ended up just adding a 1k pot before the motor to be able adjust the recording/playback speed.  I wanted to add a distortion/feedback knob and also perhaps a tone knob but I couldn't figure it out...There is barely any room inside the thing,  but a couple pots could still be added below where the track buttons are... so I may add these mods yet if I can get them figured out.

Alright,  so I finally managed to score a cheap one and hope to start bending it in the next few weeks...stay tuned!

Btw,  thanks,  EGR!

I have 2 (for bouncing purposes) ... But I'm thinking I might want to get a third one that I can bend... Maybe add pitch mod and feedback or something...

Ps..holy shit,  Seatrash,  you are one of my favorite chip artists!

i have one of these, but i've never thought to bend it at all. i may have to try this

Yeah scroll down to "manual drive tape deck" http://rhinoplex.org/8cylinder/