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Function f(x)

Function FX Parallax Tremolo Phaser

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Music Den Price: $229.00
Function FX Parallax Tremolo Phaser
Function FX Parallax Tremolo Phaser
Function FX Parallax Tremolo Phaser
Function FX Parallax Tremolo Phaser
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Function FX Parallax Tremolo Phaser
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The Parallax is a modulation mashup consisting of an optical op-amp-based tremolo with an OTA-based 5-stage phaser bolted on to the front end. The tremolo can be transparently subtle or very deep, and allows for triangle and square waveshapes that can be blended together for a full spectrum of sound shaping. The phaser front-end can be toggled on/off via a dedicated footswitch and is capable of very slow and subtle filter effects up through watery phase-shifting madness. Think of it as a flexible tremolo with a phaser riding shotgun.

Both tremolo and phaser have independent low-frequency oscillators with dedicated controls, allowing for a dizzying array of overlapping modulation tones.  We recommend trying a medium tremolo speed combined with a slow phaser speed; when the waveform peaks align, the result is really out of this world (in our opinion).

For the Circuit Nerds

We believe the overall circuit to be novel, although it is possible that somebody somewhere has made something substantially similar. We doubt it, but you never know.  However, credit is due to the old Maestro Phase Shifter, which we updated with modern components and modified for inclusion in this pedal. Our take on this classic has 5 phase stages: 4 are “swept” OTA stages with an additional “fixed” op-amp-based phase stage.

The tremolo anchor circuit is a very clean and straightforward implementation drawing from a variety of historical optical tremolo circuits and then uniquely adapted to play well with a phaser. We used a sealed vactrol (the optical element) to maximize consistency in sound from unit to unit.

As with all Function f(x) pedals, the Parallax Tremolo + Phaser features a soft-touch, relay-based true bypass switching system.


  • Optical Tremolo + Phaser in one box
  • Independent LFO controls for each modulation effect
  • Overall output Level control to match bypass volume level
  • Soft touch (true) bypass
  • Top mounted jacks
  • Laser-etched artwork
  • 9v DC operation (industry standard)
  • ~35mA current draw
  • Enclosure size: 4.7″ x 3.7″ x 1.4″ (12cm x 9.4cm x 3.6cm)
  • Weight: 13.5 oz (385 g)

Delivery & Returns

Shipping Policy

Free Shipping- Most orders $50.00 and over ordered from SHIP FOR FREE, but there are two exceptions: Orders that are being shipped to a location that is not in the lower 48 United States will NOT ship for free. Also items marked as "Oversized" will NOT ship free. Those orders will ship using our Standard Shipping rate.

Standard Shipping- This is the default shipping method for orders shipping to a US state that is not in the lower 48, such as Hawaii or Alaska, Puerto Rico, or an APO/AE order. Whether an order is shipped USPS or UPS is at The Music Den's discretion depending on what the situation may require.

Orders made through will only ship to United States. We are unable to ship internationally.

It may take one to two business days to process an order before it is actually shipped out.

Shipping costs will not be refunded for returns. The buyer must assume all shipping costs when returning an item.

School Servicing- Items will be delivered to the school on our next scheduled weekly visit.

In-Store Pickups- You can choose to pick items up at our Randolph Store. Please call ahead to make sure that your item is at the store before coming to pick it up. Be prepared to present identification and the purchasing credit card during pickup.

Curbside Pickups- Between 10am-5pm, Monday-Friday, you can choose to pick items up at our Randolph Store and have them brought out to you. Please wait for a confirmation email that your item is ready to be picked up. When you arrive you can call the store at 973-927-5800. Be prepared to present identification and the purchasing credit card during pickup.

30 Day Easy Return Guarantee

The Music Den wants you to be fully satisfied with your purchase. The Music Den has a cash back return policy for all online returns 30 days from the date of sale. (Note: This does not apply to Reverb. Please see Reverb for their specific policies. For In-store purchases please refer to your receipt.) Please read the items below carefully to ensure that your Item Return is done correctly.


To return an item purchased online from, you must notify The Music Den within 30 days from the date of the sale to receive an RA#.

All returns must have an RA# (Return Authorization Number). To receive an RA#, Please call 1-800-479-1189 or click here to send us an email. Do not forget to mention your customer number and order number so that we can expedite your request.


All Returns must be received by the Music Den within 10 days of the day you received the RA#.


All shipping costs are the responsibility of the customer and are non-refundable.

The following items cannot be returned: Sheet Music, Books, Reeds, Strings, Harmonicas, Microphones, Clothing, CD's, Videos, DVD's, and Software.

Returned items must be in their original condition and packaging. Returned items not in their original condition will be charged a 15% restocking fee.

Special orders can only be returned at the discretion of a Store Manager with a restocking fee added. All deposits on special orders are non-refundable.

When you ship your item, make sure that your RA# is printed clearly on the outside of the package.


Ship the item to:


The Music Den
1030 Route 10 West
Randolph, NJ 07869


For answers to any questions about our return policy, please call 1-800-479-1189 or click here to send us an email.

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