Zynthian: https://zynthian.org https://zynthian.org Or Mod DUO: https://mod.audio/mod-duo/ https://mod.audio/mod-duo/ .. can both do what you want, and a to

Zynthian: https://zynthian.org https://zynthian.org Or Mod DUO: https://mod.audio/mod-duo/ https://mod.audio/mod-duo/ .. can both do what you want, and a ton more to boot - I know you specifically asked for simple and cheap - well, these devices are cheap and .. amazing ..