I was playing around just now, and found something quite peculiar!
Check this out:
https://cloud.fripost.org/s/pdM7JFtAKKZw4xZ
I play a completely normal Seydel Session Steel G (paddy) PowerBender, no magnets or anything. (The only somewhat unusual part of the setup is a curled up sock inside my cupped hands.)
There are at least three non-standard things going on! Some of them might be hard to hear in the recording, but if you listen closely you should be able to discern the following:
1. Drones with shifting overtones
2. Bending overblows (probably the least uncommon of the three)
3. A faint sound, like from a plucked reed or a kalimba, which comes out when I move down from the higher note!
The third one is something I've never heard before, and never saw described anywhere. It's very distinct for me when I play, but a bit less so for a listener. Still audible though! The drones are produced by cupping tight enough that some air gets in "backwards" through the bottom plate, but as for the plucked note I have no idea whatsoever what the harmonica is doing inside
Does anyone have some input of what it might be that I'm up to?
I've played around with backwards-air drones before, and I bend overblows all the time, but usually not together. There seems to be something with this combination that triggers the extra sound. For me, while I play, the forward note + the chord + the plucking sounds sort of like controlling three instruments at once I would recommend anyone with any grasp of the two "basic" techniques to give it a try! It would be interesting to see if someone could reproduce it