[JeremyHerrman]

author here - I was specifically talking about digital knobs on touch screens having both spin gestures AND horizontal/vertical slide gestures.

If you can point me to a DAW besides Garageband on iPad which was on a touchscreen with those three gestures I would love to try it out!

[squeaky-clean]

Those gestures have been pretty standard with mouse movements in music software for a while. Apple brought it to touchscreen, but they didn't invent the multi gesture knob interface.

I had a Novation Zero SL mkii in 2008 which had a "universal knob". It acted as an HID mouse input and when you spun the knob it would click your mouse and drag it vertically. It worked with most music software at the time because vertically dragging a knob had become fairly standard.