Baritone / Tenor Horn / Euphonium
Use a floor stand and have the lead pipe (attached to the mouth piece) moved to the other side of the instrument.
Electric Guitar / Bass Guitar
Use a Chapman Stick one-handed to create an electric guitar/bass guitar sound using a ‘hammer on‘ technique.
Ukulele
A Strum Buddy allows a ukulele to be played with one hand or an Artiphon Instrument 1 can be used in ‘tap’ mode so that the finger that selects the pitch of the note also triggers the sound.