Input 1 is also equipped with other functions: it has a Compressor and a switch that changes the characteristics of the channel according to the type of instrument selected:
1. Flat: "standard" equalization for acoustic and classical instruments. With this equalization channel 1 is identical to channels 2 and 3
2. Bass: suitable for instruments particularly rich in bass (such as electric, acoustic or double bass)
3. Jazz: suitable for electric or semi-acoustic / jazz guitar