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