The Expanse controls
Expression jacks
Separate jacks let you simultaneously control WIDTH and either EXPANSE or VELOCITY with any expression pedal, including the Expanse-themed expression slider, or the regular MAS Effects Desktop Expression Pedal.
Sweeping range of the tremolo (on bottom 2 OUTER SPACE settings)
or Spacing between echoes (on upper OUTER SPACE setting)
Speed of tremolo sweep
Amount of atmospheric ambience
VASTNESS (Unlabeled upper-right knob)
Amount of space added when pressing the VAST EXPANSE foot switch
(Interactive with EXPANSE. e.g. Higher EXPANSE settings make this more responsive. Experiment to get a feel for it)
Overall effect level. Gives up to 2x boost to compensate for the perceived drop in volume from tremolo
Mixes dry and wet signals
Sets the mode of the pedal:
  • DOWN: Harmonic tremolo only. EXPANSE is disabled
  • MID: Adds expansive reverb
  • UP: Adds echoing feedback
Selects between different voices:
  • DOWN: Sensible and beautiful harmonic tremolo
  • MID: Slightly more severe, with different frequencies on the high and low pass filters, and more resonance
  • UP: The low frequency oscillator (LFO) not only pans between the filters, but also shifts their frequencies. The WIDTH knob has a much bigger impact on the sound than in other WARP settings as it also shifts the resonance
VAST EXPANSE (foot switch)
Temporarily pushes the EXPANSE beyond EXPANSE its limits. Its added amount is controlled by VASTNESS
BYPASS (foot switch)
Tap to toggle between engaged and bypassed (true bypass). Hold to temporarily toggle, the release to switch back
Internal Trimmers

An internal trimmer sets the ceiling of the EXPANSE knob.
Another sets the LED brightness, which can reduce power consumption if needed.

Favorite Settings

Coming Soon

Technical Specifications

Power supply
9V DC, 2.1mm center negative (not included). No internal battery clip.
Power consumption
70mA to 110mA depending on LED brightness, set with an internal trimmer. By default it's around 100mA and you can safely plug it into a 100mA port on a multi-port power supply.
True bypass, relay controlled with a soft-touch switch. Hold to temporarily engage/bypass.
In / Out Jacks
1/4" mono (TS)
Expression Jacks
1/4" stereo (TRS)
94x118mm footprint (3.7" x 4.65"), 60mm tall including knobs (2.36")


The Expanse, like all MAS Effects pedals, is covered by a generous Forever Warranty. Follow this link for details.


These are just a few. See them all in our shop

I mean…look at it…

I initially wanted a more versatile tremolo than the one I owned. Once I found the Expanse, there was no other competition. Ramping feature, two expression jacks, reverb and delay?! The build quality, the merchandising included, and of course the sound, represents what everyone should want with their purchase…a gift. Inspiring. Instantly played in way I hadn't before (bass). Más is considerate of your pedalboard with top mounted jacks and standard dimensions. Did I mention the looks? I mean…look at it…

-- Darren B.

The Expanse can transform what you know about Harmonic Tremolo Pedals

MAS Effects makes some inspirational pedals and I bought this primarily because I love when builders combine trem with reverb. This one exceeded my plans for the pedal. Running it 3rd in the chain behind a pre amp and some fuzz, I planned on running the tremolo early, but I was blown away with the reverb and echo on the pedal. It transformed the potential of the board and allows for some creative ambient / spacey moods that I wouldn't typically be able to create. The modes and options on the pedal are very limitless and despite using it often, I can still get lost in it on occasions. The packaging and amount of goodies you get with it makes it opening it feel like a celebration - its an incredible pedal I would highly recommend

-- John D.

Great unique effect!

This pedal is really something special. I was looking for something a bit more "ambient" but I don't normally play that type of music so I needed something that could also do some less washy, ambient sounds as well. The harmonic tremolo is great especially in the second position and the reverb can be dialed in subtle or over the top. I wish the reverb died out when you turn it off, but that's a small price to pay for an excellent pedal. Well done MAS-Effects!

-- Matthew N.

Great sound, great build.

"I've had this pedal on my board for months, and it's only removed when I use it on keyboards (it's particularly effective on Mellotron). This pedal really shines in the studio, and records beautifully. It's a very musical pedal that sits well in all kinds of mixes. The build quality is also very impressive. Cheers!"

-- Rob Muller

Fall in love with any setting

This thing does exactly what Mark says in the description... you can play with it for hours and just have fun with it. However the sound is so high fidelity that you can fall in love with any setting you find and just leave it where it is for your set list. It's really, really cool. It's unfair to call it a harmonic trem because it's really like 9 different things at once. Saw it on TPS."

-- Michael B.

Awesome pedal!

Looking to travel to space in style? The Expanse is your answer.

-- Chris H.

Desktop Expression Slider

[limited edition]

We've also made a limited number of Expanse-themed versions of our popular expression slider.

It makes a great companion to The Expanse.

Your Content!

Send in your audio, video clips, or pics and we'll post them here. Let everyone see and hear what you're doing with The Expanse