PedalBro

Envelope Filter · PastFX

PastFX Lowpass Filter PX-101

The PastFX Lowpass Filter PX-101 is an envelope filter pedal with a 2/4-pole switchable filter, envelope follower, and expression pedal input. It features controls for drive, mix, resonance, envelope amount, and filter cutoff, along with switchable smooth and fast response modes.

  • 9V DC · center −
  • 120 mA
  • True bypass
  • Analog
New
from $248.67
Used (asking)
No listings yet

The rundown

Highlights

  • Switchable 2-pole and 4-pole filter modes
  • Envelope follower with adjustable amount and cutoff
  • Expression pedal input for dynamic control
  • True bypass switching
  • Runs on 9V DC with battery compatibility

Best for

Bassists and guitarists seeking dynamic filter effects with flexible control options and expression pedal integration.

Quick facts

Power
9V DC
Current draw
120 mA
Polarity
Center negative
Bypass
True bypass
Dimensions
59.9 × 112 mm
Controls
Drive, Mix, Resonance, Envelope Amount, Filter Cutoff, 2/4 Pole, Smooth/Fast
Status
In production

Where to buy PastFX Lowpass Filter PX-101

$248.67 lowest new price · Reverb

Current offers
SellerConditionPriceLink
ReverbNew$248.67View

Prices last checked 22 hours ago. Links to sellers are affiliate links.

Frequently asked questions

What power supply does the PastFX Lowpass Filter PX-101 use?

The PastFX Lowpass Filter PX-101 runs on a 9V DC supply with 120 mA current draw and uses a center-negative connector.

Does the PastFX Lowpass Filter PX-101 support expression pedals?

Yes, the PastFX Lowpass Filter PX-101 includes an expression input for controlling parameters with an external expression pedal.

Is the PastFX Lowpass Filter PX-101 true bypass?

Yes, the PastFX Lowpass Filter PX-101 features true bypass switching.

Similar pedals

Same type, similar features.

Specs from pedalfilter. Summary written by PedalBro from those specs and public descriptions.

Page last updated September 29, 2026.