"3.2.7 Compensated Out
A frequency corrected signal will leave this jack if you connect it to a mixer or
recording device. Use it to quietly compose or send an auxiliary signal to a
console etc. For quiet sessions, just turn the master volumes to “0”. Recording a
loudspeaker through a microphone is the preferred choice of recording engineers.
The compensated out was designed as an alternative for those of you that don’t
have a studio at your fingertips."