You will never guess the difference between the two versions. (The tap version also responds to MIDI clock, which will override tap tempo.)
At its core, the Zarp patch models the EQD Arpanoid. I think. I’ve never actually used one in person, so I have some lingering questions about the steps control. And the pitch shifting for the two products sounds different.
But I also expanded on the concept: there is an extended range mode, that adds an octave below, an octave above, or both, where appropriate; the directions can be “deformed,” introducing new rhythms; a glide control allows you to glide between steps; I threw on a tone control (low-pass filter) to tame some of the pitchiness of the higher octave sounds (if you would like); the arp can be bypassed with a latching or momentary footswitch, and there is a control to fade the arp in; there’s a retrigger option, so you can trigger the arp to begin with new playing; and there’s a stereo pan… oh, right, it’s in stereo.
So, the concept remains familiar, but the possibilities to fine-tune and extend that idea are quite extensive.
The audio path is stereo in and out. The retrigger signal is taken from the left input. When used in mono, the pan should function as a tremolo with the pan spread control acting as a depth control.
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The footswitches change a little, depending on the version (seeing as Zarp does not have tap tempo, but Zarp Tap obviously does).
Left footswitch — Zarp — turns the arpeggio on/off; when the momentary button is on, this becomes momentary, when it is off, latching
Zarp Tap — tap tempo
(There are also clock dividers in series on the second page.)
Middle footswitch — Zarp turns the panning on/off
Zarp Tap — turns the arpeggio on/off; same functionality as left footswitch for Zarp
Right footswitch — Zarp — no function
Zarp Tap — turns the panning on/off
Green controls are the same as those found on the original Arpanoid.
Wet level, dry level, rate (in the non-tap version), and steps.
The modes are 8 UI buttons across the middle of the page and follow the same pattern as the Arpanoid: -1 oct to root major, root to +1 oct major, -1 to +1 oct major, random major, then the same for minor.
There are also three UI buttons to select between up, up/down, and down.
Magenta controls expand the those options:
Glide — introduces gliding between steps
Deform — (my favorite control) changes the swing of the LFOs used to produce the different arpeggios, resulting in a variety of new rhythms
Tone — a low-pass filter that can be used to tame some of the octave up sounds
Scattered throughout the page are blue pushbuttons:
Extended range — this extends the range of the arpeggios (e.g., mode 1 will sweep from -2 octaves to root, mode 3 will sweep from -2 octaves to +2 octaves)
Retrigger — retriggers the LFOs with new audio (this uses an envelope follower, not an onset detector, so there must be silence between the notes), so the arpeggios begin at the same place
Momentary — switches the on/off footswitch (left for Zarp, middle for Zarp Tap) to momentary rather than latching behavior
There is also a white control next to the momentary button called “Fade time” which determines how long it takes the arpeggios to fade in once the on/off switch is activated.
Finally, there are aqua controls to affect the panning:
Pan shape — off = triangle, on = square (ping-pong)
Pan spread — this is a -1 to 1 value module; at 0, there is no panning, at -1 or 1 the panning covers the stereo spread (but moving from one to the other inverts the shape of the panning); panning is tied to the arpeggio rate