I am selling today my Ketron SD1 Boooo
SO much hours of live music with it !! It was my first pro kb I owned.

But... no more used it since many years, so time to sell. I have too much keyboards at home

I have just plugged it again on good speakers...
wow this keyboard definitely has something that is not found in other keyboards.

Not sure what it is.

The same sounds on newer keyboards does not sound the same...

Maybe the reverb, or the converters, or the analog stage... I don't know...