BOSS BR-900CD
Owner's Manual

Mastering Tool Kit Parameter Functions

Compressor
This compresses the overall output signal when the input volume level exceeds a set value.

Mixer
Adjusts the volume of each frequency band.

Lo Level

-80� +6 dB

On/Off
This parameter turns the compressor effect on/off.

OFF, ON -24�0 dB

Sets the volume level of the lower range after the signal passes through the expander and compressor.

Lo Thres

Mid Level

-80� +6 dB

This sets the volume level at which the lower-range compressor goes into effect.

Sets the volume level of the midrange after the signal passes through the expander and compressor.

Lo Ratio

1:1.00�1:16.0, 1:INF

Hi Level

-80� +6 dB

This sets the ratio of suppression of the lower-range output when the input level exceeds the Lo threshold level.

Sets the volume level of the upper range after the signal passes through the expander and compressor.

Lo Attack

0�100 ms

This sets the time it takes for the lower-range compressor to go into effect once the input level exceeds the Lo threshold level.

Limiter
This suppresses high-level signals to prevent distortion.

Lo Release

This sets the time it takes for the lower-range compressor effect to stop once the input level falls below the Lo threshold level.

50�5000 ms

On/Off
Sets the limiter to ON or OFF.

OFF, ON -24�0 dB 0�100 ms

Mid Thres

-24�0 dB

Thres Attack

This sets the volume level at which the midrange compressor goes into effect.

Adjust this as appropriate for the input signal from your bass. This sets the time it takes for the limiter to go into effect once the input level exceeds the threshold level.

Mid Ratio

1:1.00�1:16.0, 1:INF

This sets the ratio of suppression of the midrange output when the input level exceeds the Middle threshold level.

Release

50�5000 ms

Mid Attack

0�100 ms

This sets the time it takes for the midrange compressor to go into effect once the input level exceeds the Middle threshold level.

Adjusts the time until when the limiter will turn off after the input level falls below the threshold level.

Mid Release

50�5000 ms

Output
This makes settings that affect the overall output.

This sets the time it takes for the midrange compressor effect to stop once the input level falls below the Middle threshold level.

Hi Thres
into effect.

-24�0 dB

Level

-80� +6 dB

This sets the volume level at which the upper-range compressor goes

Sets the volume level of the overall sound after the signal passes through the limiter.

Hi Ratio

1:1.00�1:16.0, 1:INF

Soft Clip

Off, On

This sets the ratio of suppression of the upper-range output when the input level exceeds the Hi threshold level.

This suppresses noticeable distortion occurring with heavy use of the compressor/limiter effect.

Section 3

Hi Attack

0�100 ms

Dither

OFF, 24�8 BIT

This sets the time it takes for the upper-range compressor to go into effect once the input level exceeds the Hi threshold level.

This prevents the action of muting sounds from being too noticeable.

Hi Release

50�5000 ms

This sets the time it takes for the upper-range compressor effect to stop once the input level falls below the Hi threshold level. * With the compressor, the level is automatically adjusted to the optimum setting according to the threshold (Thres) and ratio (Ratio) settings. In addition, since lengthening the attack (Attack) setting may result in distortion, a buffer (margin) of -6 dB is provided. Adjust the Mixer level as needed.

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