Dave Lockwood

Hello everyone - I'm struggling with TTS-1, as I've experienced several issues. When I record a piano/organ (probably not specific to those instruments) part, it doubles a note (maybe 2) an octave lower. Also, if I play a patch for a few seconds, I'll frequently have a note that just hangs. Any possibly solutions here, or is there a recommended replacement for TTS-1? Thanks in advance, Dave Lockwood