Roland MMP-2 Compressor Type TYPE, Key In Channel KEY IN, Threshold THRESH, Ratio RATIO

Using Effects

Compressor Type (TYPE)

This chooses the type of compressor.

“SOLID”:Semiconductor compressor characteristics

“TUBE1”...”TUBE4”: Vacuum-tube compressor characteristics

Key In Channel (KEY IN)

The compressor operates when the input level of the channel specified here exceeds the threshold. You can choose either channel 1 or channel 2. Normally, the same channel is specified, but a different channel may be specified for special uses. For example, when there is a microphone input and a background music input, setting the microphone channel as the key-in for the background-music channel reduces the volume of the background music when the microphone picks up someone speaking.

Threshold (THRESH)

When the input level exceeds this value, the output is lowered or suppressed according to the ratio. You can set a value from -24.0 dB to 0.0 dB.

Ratio (RATIO)

This is the ratio for suppressing sound that exceeds the threshold. You can set a value from 1.00 to infinity. When infinity is selected, the output level won’t get any louder even if the input level gets louder than the threshold. This is the same effect as using a limiter.

Knee (KNEE)

This setting determines whether the change in the relationship between the input level and the output level is abrupt or gradual when the input crosses the Threshold level.

“HARD”: Immediate change before and after the threshold

“SOFT”: Sloping change centering on the threshold

Attack Time (ATTACK)

This sets the time after the input signal exceeds the threshold until the compressor effect is completely applied. You can set a value from 0.0 ms to 800.0 ms.

Release Time (RELEAS)

This sets the time after the input signal falls below the threshold until the compressor effect disappears completely. You can set a value from 0 ms to 8,000 ms.

Compression Level (LEVEL)

This sets the output level after passing through the compressor. You can set a value from -24 dB to +24 dB (from -24.0 dB to +6.0 dB in case Auto Gain is “ON”). If you are compressing the signal to even out the loud points, you may want to boost the overall output level using this control.

Auto Gain (A-GAIN)

The dynamic range is reduced when sound passes through the compressor, but setting Auto Gain to “ON” boosts the overall output level so as to match the original overall input level.

Specifically, this assures that the output level is loud but not distorted by creating a margin (output level upper limit at 0 ms of attack) of 6 dB from the clipping level (0 dB) and then boosting the output level to this point.

When the attack is set to a long time, the start of the compressor effect is delayed, and so depending on the input signal the sound may be distorted. The Auto Gain has a margin of 6 dB to prevent spiking of the output level due to this delay in the compressor effect.

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