Unify Manual

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Pump House

Unify's built-in Pump House effect applies tempo-synced, rhythmic volume modulation to any sound.

Pump House acts like a traditional analog voltage-controlled amplifier modulated by a tempo-synced LFO. The shape of the LFO waveform (the gain curve) can be edited freely, and the rate and depth can be set independently.

Adjusting the modulation rate

The frequency of Pump House's internal LFO is set using the pop-up menu labeled “Length”. The LFO is always tempo-locked to the Transport, so the available choices are based on beats and bars (measures).


Pump House's LFO curves are sample-accurate, and it's possible to have nearly instantaneous steps up or down. This will always happen if the right curve end-point is lower or higher than the left one, because the curve represents one cycle of a continuously-repeating waveform. Such abrupt transitions can result in annoying clicks, especially when the audio is mostly low bass frequencies.

The smoothing checkbox (added in Unify v1.8) tames this effect, by limiting the speed at which the LFO value can change. It's ON by default; switching it OFF restores the pre-v1.8 behavior.

Adjusting the modulation depth

The Depth knob adjusts the depth of gain modulation. The higher the knob setting, the lower the minimum gain. At 100% depth, the gain modulation may go all the way down to zero (silence).

Adjusting the gain curve

In Pump House gain curves, the horizontal axis represents time, with 0 at the left and 100% (of the chosen beat length) at the right. The vertical axis represents the gain, with 0 at the bottom and 100% at the top.

Click (single-click) the gain curve in the main Pump House GUI window to open the pop-up gain-curve editor. This works very similarly to other curve-editors in Unify, such as the velocity-curve editors in the layer-stack view. Use the mouse as follows:

  • Drag either endpoint (circles) up or down
  • Drag up/down on the line between the endpoints to adjust the shape of the curve (convex or concave)
  • Double-click between endpoints to add a new “split point”
    • This splits the curve segment in two
    • Split points can be dragged up/down and left/right
      • Hold down ALT (Option on Mac) while dragging to lock the left/right position and adjust up/down only
      • Hold down SHIFT while dragging to enable snap-to-grid
    • Individual curve segments can be dragged up/down to adjust shape
  • Double-click any split point to delete it
    • This merges two segments back into one
  • Right-click to pop up a small menu of operations:
    • Copy curve shape puts the current curve shape onto your computer's clipboard
    • Paste curve shape pastes the curve shape from the clipboard (if there is one)
    • Save curve preset… is an alternative to the Save… button
    • Load curve preset… is an alternative to the Load… button

The three buttons above the graph area allow you to reset to a straight line or use saved curve presets:

  • The Reset button reverts the curve shape back to the straight-line “identity” curve, as shown
  • The Load… button lets you load a previously-saved curve-shape preset (XML file)
  • The Save… button lets you save the current shape as a new curve-shape preset
  • The Presets… button provides a shortcut alternative to Load, displaying a multi-level menu of available curve-preset in the Pump House Curves folder.
pump-house.txt · Last modified: 2022/02/08 20:53 by shane