DISCLAIMER: Joel stutters. If this is somehow upsetting or otherwise unpleasant for you, kindly piss off and buy a different pedal.
This video explains how to use the ramp knob in the Warped Vinyl™ Analog Vibrato / Chorus guitar effects pedal. Simply put, this is a magical knob. Due to the digital control of this pedal, you can set this knob to control any of the five parameters individually or simultaneously (volume, mix, rpm, depth, warp) and have it either modulate or ramp-and-hold (rise or fall) via dip switches in the back of the pedal. Essentially, this knob controls the ramp time in which this takes place. You can even make a tremolo effect by choosing to modulate the volume knob. Stock out of the box, this knob emulates the BOSS™ VB-2 "Rise" knob by ramping up and holding the depth setting to wherever the depth knob is set.
More information can be found at www.chaseblissaudio.com.