MXR M132 Super Comp  is a compressor guitar effects pedal based on the classic MXR Dyna Comp design, but with an additional Attack Level control for greater flexibility.

What it does

A compressor evens out your guitar's volume by:

• Reducing peaks from hard-picked notes
• Increasing sustain
• Making clean tones sound tighter and more polished
• Helping lead notes sing and sustain longer

The M132 is popular for country, funk, clean rhythm, and smooth lead tones.

Controls

• Output: Sets the overall output volume.
• Sensitivity: Controls the amount of compression.
• Attack Level: Lets more of the note's initial attack come through before compression kicks in. With this control turned down fully, it behaves more like a traditional Dyna Comp.

Key features

• Classic Dyna Comp-style compression
• Added Attack Level control
• Preserves pick attack while maintaining sustain
• Works well with high-output pickups
• True hardwire bypass 

Tone character

Compared with the standard Dyna Comp, the M132 can sound:

• Less squashed
• More dynamic
• Better at retaining pick definition
• More versatile across different guitars and playing styles

In short, the MXR M132 Super Comp is essentially a Dyna Comp with an extra Attack control, designed to give you the classic compression sound while allowing more of your natural playing dynamics to shine through.