This is a Yamaha THR10II. It supports guitar, bass, and acoustic guitar, but I think it's mainly for guitar. I tried connecting a bass, but it felt like it could produce sound. I've never used it with an acoustic guitar. I'm selling it because I'm switching amps to a bass amp along with switching from guitar to bass. I think I bought it about three months ago. I haven't used it that much, but I did take it out of the box, so it has a little bit of a used feel. It works without any problems. Thank you.