This Darkglass AO500 amp has been used for several gigs in addition to practice, and still in excellent condition - fully functional, very minor cosmetic defects in paint on a couple of edges. The Super Intelligent Footswitch is included, and can be used to switch between presets on the amp (setup through the Darkglass suite) and has a mute function.

From Darkglass site:

The Alpha·Omega 500 takes the best elements of our most successful distortion preamplifier ever, combined with state of the art features to make a powerful 500-watt amplifier. While Darkglass' signature Alpha and Omega drive engines add incredible girth and size to the overdriven signal, the studio-grade VCA compressor adds an extra layer of control, and the ultra-quiet 6-band graphic equalizer can help sculpt the tone from aggressive and overdriven to crystal clear clean, whatever your needs may be.

- 500w amplifier with the signature Darkglass distortion engines
- Cab sim with 3 selectable impulse responses
- Studio-grade 6-band graphic EQ and intelligent compressor
- Expanded connectivity with aux in, headphone output, and DI output
- USB connector to load user impulse responses

Elevate Your Bass Tone:

A new superior custom-designed Darkglass high-efficiency class D power amplifier module is the heart of this new line of our 500 Watt amplifiers. It enables the usage of speaker cabs with impedance as low as 2O, adding a new level of flexibility for your cabinet options. The cabinet simulation utilizes an improved version of our Cab Sim module. The module has three slots for hi-res impulse responses which are active for both the headphone output and the balanced XLR DI output.

Specs:

Controls

Passive/Active: Use this push button switch to change from passive to active mode. If your bass is active, it can have a hotter signal that makes the amp distort early (but feel free to use if such additional distortion is desired!).

Distortion: Use this push button to turn the Alpha·Omega Engine on or off to add natural compression, organic harmonic enhancement, and saturation ranging from mild overdrive to high gain bass rage.

The Alpha·Omega Engine operates before the clean section (you can therefore use the 6-Band Active EQ for additional tone shaping).

Bite: Boosts high mids (2.8kHz) for additional presence and definition.

Growl: Shelving Bass Boost for a fatter tone and increased low-end saturation.

Compression: This knob controls the amount of dynamic compression added to the Alpha·Omega Engine. The makeup gain is adjusted automatically. Compression can be turned off or assigned using the Darkglass Suite.

Drive: This knob controls the amount of distortion that the Alpha·Omega Engine will deliver. It will change from a soft, warm overdrive to a massive, modern distortion sound.

Level: Use this knob to control the output volume of the Alpha·Omega Engine.

Blend: Use this knob to mix between the Clean signal and the Distortion signal (Alpha·Omega Engine).

Mod: Selects or mixes between the two distinct distortion circuits: Alpha is punchy and tight with a lot of definition, whereas Omega is simply brutal and raw.

Bass: +-12dB at 80Hz. Use this slider to change the low-end content of the signal.

Mids: +-12dB at 250, 500, 1.5k and 3kHz. These sliders control the mid content of the signal.

Treble: +-12dB at 5kHz. Use this slider to change the high content of the signal.Master: Use this knob to control the overall volume of the amplifier.

Mute: Use this push button to mute the amplifier.

Technical Specifications:

Input Impedance: 1MΩ
Minimum Load Impedance: 3Ω
Maximum Power Output: 500 W RMS @ 4Ω
250 W RMS @ 8Ω
Power Amp Input Impedance: 1MΩ
Power Amp Input Level: 2400 mV RMS
Pre-Amp Output Impedance: 1kΩ
Pre-Amp Output Level: 2400 mV RMS
Maximum Power Consumption: approx. 700VA
Forced-air cooled
AC Input Power: 100-120/210-250 VAC (using selector switch on left side panel).
Cycles: 50/60 Hz

Dimensions

Width: 18 cm / 7.1″
Length: 23 cm/ 9,1″
Height: 7,1 cm / 2,8″
Weight: 2.4 kg / 5,29 lb

Darkglass Alpha Omega Super Intelligent Footswitch:

Alpha-Omega Super Intelligent Footswitch has three programmable footswitches for assigning channels (Clean, Alpha, Omega, Mod) and compressor state (On or Off). It also has a separate mute footswitch. The channel footswitch functions are programmed through Darkglass Suite, and settings are stored on the Alpha Omega 900 amplifier.

DIMENSIONS:

Length: 220 mm
Depth: 45 mm
Height with buttons: 48 mm
Weight: approx. 450 g