Bending the Speak and Math is a lot more satisfying than the Speak and Spell was, for a number of reasons:
1. Slightly better mechanical proficiency, with practice.
2. Found a better bend chart. The Reed Ghazala diagram is for a completely different revision of the board.
3. Improved ghetto soldering skills.
4. Better ideas about how to fit the controls into the case. On the Speak&Spell I couldn't work out where a full size potentiometer would fit so I sacrificed the battery compartment. This time I just boogered out part of the case to make room up by the handle.
5. Doubling up momentary switches with toggles. So you can trigger the loop toggle, then flip the switch to hang onto it.
6. Better -- no crash -- pitch control. Ended up hooking in-line a big-ass 47k resistor, but hey if I ever need to pass 200 volts down that path, I'm set.
7. Overall, more awesome bent madness with this model. The proof is in the sound. Plus the Speak and Math puts something resembling line level out the earphone jack; my speak and spell I had to use my Putney CV cable, which has a 10K resistor in line.