Compact keytar with built-in sounds?
New keytars are hard to find with built-in sounds, especially now that Roland have discontinued their AX-Synth and Lucina (here’s hoping for new models soon)! However, Korg still make the RK100 (around £600) which has 200 decent quality programs built in. Alternatively, you could try and find a Yamaha DX100 which has strap holders, classic FM sounds, four octaves and battery power. Or grab any of the Yamaha Reface series and add the keytar attachment.