Lee Oskar diatonic, and custom Spiral tuning. Chromatic harps
by Hohner and Suzuki.
I built this lap steel to sound like a Pedal Steel Guitar using palm-levers to raise the pitch of two strings. Live video here: https://tinyurl.com/y6hcaf63
This 6-string acoustic guitar became a Hindustani Slide with the addition of twelve sympathetic "buzz" strings. See video here:
Live video here: