Hi, when I play a chord on my Casio-656 keyboard it sometimes sounds out of tune - if you hit the chord again it plays correctly. Is this a fault or a setting? It seems to be intermittent so that would suggest perhaps a fault. It's often the first time you play the chord that this fault occurs, then it's ok again for a while. I've only started using the keyboard and have no instructions! Any help would be gratfeully received - thanks

This type of distortion in keyboards is created sometime by combination of aftertouch used with sound effect. Switch off aftertouch for sounds like piano. I never used Casio 656 - if there is no aftertouch function then check chorus setting for particular sound - ex for piano chorus shall sound like whipping Piano timbre is sensitive for velocity and it may be the reason of change in perception.

I would check your fingering... You MAY be late in hitting a particular note and the using auto chord... this can cause the problem. Another thing is if notes are hit with different velocity that can affect the sound. Sometimes certain voices have VELOCITY switching which actually changes the voice depending on the velocity you hit a note.