Peavey Austin 400 is a versatile amplifier designed for both electric and acoustic guitars. It features two channels - one for electric and one for acoustic guitars, each with dedicated inputs and gain controls. The acoustic channel has a high gain input for piezo pickups and a low gain input for instruments with built-in preamps. The amplifier also has a 3-band EQ with sweepable midrange, a "pull bright" switch for added high-end clarity, and a DDT compression circuit for increased headroom and clarity.