So back in my younger days my Dad had a Boss DF-2 Super Feedbacker & Distortion effect pedal my brothers and I would use sometimes as kids. It wasn't super great but it did have the interesting feature of holding and sustaining a note or harmonic feedback. You'd play a note and press it down. If it was one clean note it would hold that endlessly while the pedal was pressed down. if you played a chord or multiple notes and did that it kind of had a mind of it's own. Lots of older folks here so I bet some of you may be familiar with it. Would be a feature I'd be interested in if there are modern options that are similar yet better. Wondering what those options may be. I could buy a pricey old used one off eBay or Reverb but I'm wondering if there is something new and modern that does the same thing but better. Let me know if you have any ideas for me. Picture of what it was below.