Tonematch Mixers / Compressor
MikeZ-at-Bose talks about the Compressor settings in the T1 ToneMatch Audio Engine[1]
Light is about 2:1, fast attack and release.
Medium is about 3.5:1, fast attack and release.
Heavy is about 6:1, fast attack and release.
All have 'soft knee' transitions.
Hope this is helpful. When tuning the compressors I relied much more by ear to determine the settings than by numerical values.
A couple of comments on the settings.
When doing general compression like is done in the T1, I found fairly fast attack and release times to be the most versatile. Slower times need more fine tuning and are more prone to artifacts when used heavily.
The threshold is the most important control on any compressor, in my opinion. Careful adjustment of this is super important. You need to make sure you are compressing the parts of the instrument that you want to compress (peaks, 20% of the time, 100% of the time etc.)
Notes from pages 22 and 23 of the T1™ manual
Using compressor/gate functions
The Comp/Gate function provides access to gate, compression, limiter, de-esser and kick drum presets with adjustable parameters. Note: To bypass the Comp/Gate settings, press the Type button. Press it again to activate.
1. Rotate the Type button to access the list of Comp/Gate effects and highlight your choice:
- Compressor 1: Light
- Compressor featuring a preset low-compression ratio with variable threshold and gain parameters. Works well as a general-purpose compressor for most instruments and microphones that require minimal level control.
- Compressor 2: Medium
- Compressor featuring a preset moderate compression ratio with variable threshold and gain parameters. Works well with basses, guitars, keyboards, and vocals requiring subtle level control.
- Compressor 3: Heavy
- Compressor featuring a preset high compression ratio with variable threshold and gain parameters. Works well with loud instruments – like horns and drums, as well as strong vocals that require more aggressive level control.
- Limiter
- Hard limiter featuring a preset ratio (8:1) with variable threshold and gain parameters. Works well with very loud instruments, such as drums, to prevent signal peaks from overloading the channel.
- De-Esser
- Side-chained compressor featuring a preset compression ratio with variable threshold and gain parameters. Designed to reduce sibilance on vocals.
- Noise Gate
- Noise gate with a fast preset attack time, variable threshold, and variable speed (release time). Well-suited for eliminating unwanted noise from microphones and instruments.
- KickGate 1: Regular
- Gate featuring a preset attack time, and variable threshold and tightness (release time) parameters. This is a Bose® proprietary technology designed specifically for kick drums. This robust gate provides maximum gain before feedback, making your kick drum as loud as possible through an L1™ system.
- KickGate 2: Fast
- Same as KickGate 1 – but adjusted for faster tempos. Select this setting if you are using a double bass drum pedal.
2. Press the Select button to select your choice, or press the Cancel button to exit the list with no change.
3. For Comp1-3, Limiter, De-Ess:
- Rotate the Thresh button to adjust the input threshold (trigger) level from -50dB to 0dB.
- Rotate the Gain button to adjust the gain from 0dB to 30.0dB. The gain bar above the button shows the amount of gain reduction. This display helps in setting the threshold.
For Gate:
- Rotate the Thresh button to adjust the input threshold (trigger) level from -90dB to -30dB.
- Rotate the Speed button to set the gate closing speed to any value from 0 (fastest) to 100% (slowest).
For Kick1-2:
- Rotate the Thresh button to adjust the input threshold (trigger) level from -20dB to 0dB.