I have a Jimmy Behan Dizzy Tone that is wonderful for single note jams. Clarity and sustain for days, but pretty heavily gated- he builds them with less gate upon request. I have the SFT transistor version, exceptional pedal.Tonebender OC75, with bias -- Can't beat Jimmy Behan for the price, although there are some other great pedal makers too (just more $$$)
YMMV
GL