Instrument
The instrument input is a discrete impedance converter that also operates in class A mode.
The core is a low-noise field-effect transistor, which is ideally suited as an impedance converter due to its very high input resistance.
Insert
A compressor, de-esser, limiter or even a reverb unit can be switched between preamp and output.
VU
The VU shows the audio “energy” level, the clip LED warns of clipping. If optional AD converters are installed, the AD OVL LED also warns of converter overloads.