This part of a music mixing board controls features like treble & bass
I'll keep 
this simple, ... First up, a sound board (usually called a "mixing desk" in the biz, or 
just a ... An orchestra might have 150 channels, and broadway musical theatre .... 
of the "treble" and "bass" (known as "highs" and "lows") controls many home... [DOC] [TLE] A Beginners guide to mixing in GarageBand - O'Reilly Media [PAR] A good mix creates a clear, balanced, full sound; a bad mix can be lifeless, ...