- solid state amplifiers
- acoustic guitars
Udo Roesner was one of the founders of AER. More recently he has teamed up AER engineer Thomas Mattiussi to found MARco-labs in Germany and France to develop the Da Capo 75. The DaCapo 75 is a 75 watt acoustic amplifier with analogue preamps and a Class A/B analogue power amp and 6 built in effects.