I have a early British Version Trace Elliot GP7SM pre with amp in great condition. These things are a tone beast and power packed for their size.Controls are Input gain,master gain,7 band eq,pre shape section,active/passive switch,graphic level,eq balance,mute,line out and effects send and return.No issues and everything works as it should.These amps far surpass the conservative power rating thats listed and I mean they kick.Grab a piece of classic british bass tone and these are becoming harder to find. $300 OBO West coast add $15