Heavy Metal L-Gaim OVA III has a character that pilots his mecha by playing a keyboard inside the cockpit. Been quite a while since I've seen it though so can't recall if it corresponds with the rest of the features you mentioned. Thank you for your effort. Unfortunately this show is not what I'm l...

I had this VHS tape in the very early nineties. American version. There was an anime (possibly be an episode). The only thing I remember were mecha (not really giant), which landed on some planet I think. These also maybe fighter spacecraft, but I think those were robots. The pilot was a young guy. ...