Panel reference Global controls Mix Set the mix between dry and processed signal with the Mix knob. By setting a mix <100% you can use the Master Bus Compressor for parallel processing, i.e. the dry and effect signals are being output together. Compression controls Compressors reduce the dynamic range by evening out the difference between loud and quiet signals. This makes signal levels easier to balance, and can add punch and sustain to the sound, as well as “glue” together a final mix. The parameters are as follows: Input Gain Adjust the input gain to the Master Bus Compressor. Range: +/- 18.00 dB Threshold Set the level at which onset of compression should occur. The lower the Threshold, the more compression is applied.Range: -30 dB to 0 dB Ratio Ratio specifies the amount of gain reduction applied to signal levels above the set Threshold. A 2:1 compression ratio effectively means that a signal level 2dB above threshold will have a signal gain of 1dB. Set the amount of gain reduction applied to the signal above the set Threshold. Range: 2:1, 4:1 and 10:1 Attack Set the time it should take before the compressor should react to signals above the set Threshold. Range: 0.1 ms, 0.3 ms, 1 ms, 3 ms, 10 ms and 30 ms. Release Set the time it should take before the compressor lets the sound through unaffected - after the signal level drops below the set Threshold. If set to “Auto”, the Release time will be program adaptive, so the Release time is automatically increased following long peaks and decreased following short peaks.Range: 0.1 s, 0.3 s, 0.6 s, 1.2 s and “Auto”. Make Up Make-Up gain compensates for level reduction caused by compression and helps maintain a steady output level. Adjust the output gain from the Master Bus Compressor device. Range: - 5 dB to + 15.00 dB Compressor Gain Reduction Meter The meter shows the gain reduction amount in dB applied by the compressor. External Sidechain You can use external signals to trigger the Master Bus Compressor. This is done by connecting an external signal to the Sidechain Inputs on the back of the Master Bus Compressor. The Sidechain inputs. When a cable is connected to the Sidechain Input(s) the “Connected” LED is lit on the front panel: Click the Sidechain button to “key” (trigger) Master Bus Compressor from the external signal instead of the channel signal. For example, you could use a kick drum pattern to trigger the sidechain function, to achieve a rhythmic pumping effect.
