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TremoloVerb is a celestially large reverb cut back down to Earth size by an aggressive tremolo. Use the Sine, Triangle, Peak, Ramp or Square waves to create a rhythmic ambience; Random and Sample/Hold to create a convulsing cloud; Envelope or ADSR to control the reverb with your playing; or the Expression Pedal to control it with your foot.

H9 Control View - Click (+) for more info

TremoloVerb Algorithm Controls
Mix [MIX]
wet/dry mixer, 100% is all wet signal
Decay [DECAY]
decay in seconds or note-based in Tempo Mode
Size [SIZE]
room size of reverb
PreDelay [PREDLY]
pre-delay time in milliseconds or note-based in tempo mode
Low Band Shelving Level [LO-LVL]
post reverb shelving boost/cut of low frequencies with cut-off at 350 Hz
High Band Shelving Level [HI-LVL]
post reverb shelving boost/cut of high frequencies with cutoff at [HIFREQ]
Tremolo Shape [SHAPE]
tremolo shape: [SINE], [TRIANG], [PEAK], [RANDOM], [RAMP], [SQUARE], [SMPHLD] (sample/hold), [ENVLOP], [ADSR], or [EXPDL] (Expression Pedal)
Tremolo Speed [SPEED]
tremolo speed in Hz, sensitivity, or note-based in tempo mode
Tremolo Depth/Mono or Stereo [MNDPTH]/[STDPTH]
tremolo depth, in stereo mode you have the option to have mono depth (same on both channels) or stereo depth (tremolo is 90 degrees out of phase)
High Band Cutoff Frequency [HIFREQ]
the high corner frequency of [HI-LVL]. Affects the sound unless [HI-LVL] is set to 0
Output Level
At 0 the output level is unaffected. Increase the output level of the effect by up to 20 dB or lower by 30 dB.
Tempo is turned ON/OFF on the H9 by simultaneously pressing the Right Footswitch and the PRESETS button. With Tempo OFF, tapping can be used to adjust delay parameter values (displayed as milliseconds or Hz). With Tempo ON, tempo is in BPM.
Turn effect on or off..
The Middle Footswitch can be programmed to act on the loaded Preset as a programmable controller allowing the user to switch between the normal Preset parameter values and a programmed, alternate set of parameter values. It’s like having two Presets in one.
If Tempo is ON, the display indicates the current tempo in BPM (30 to 500 BPM) while tapping and the Tap LED will blink at the BPM rate. If Tempo is OFF, the display indicates the parameter value (milliseconds for most algorithms).