Another possibility for those exploring alternate controllers
The Trill capacitive touch strip](Trill touch sensors ), with 30 steps (interpolation should net finer resolution), photo shows multi touch output signal.
Available from pimoroni for £15 (strip an d interface board)
Sales Video
Hacker Video on their rigid Trill input device.
( is apparently not open source)
A couple of example projects from their blog, using other Bela sensor products.
Trill Guitar Project
Kalichord Strum - An instrument that offers nuanced rhythmic strumming