Allen & Heath CQ-20B Ultracompact 20-Channel Digital Mixer (Rackmount/Stagebox) - Manual (Page 46)

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46 User Guide
V1.1.0 Issue 1
9. Disable HOLD to start detecting feedback
frequencies; Enable HOLD to pause detection at
any time
10. Enable the RTA (Real Time Analyser) to show the
frequency content of the selected Output on the
graph.
 Repeat for any other outputs as required.