The SYSTEM-500 540 is in excellent condition and all controls have an excellent feel - see pictures.

All input/outputs are in good shape and make solid connections.

Comes with ribbon cable.

Used in a smoke-free environment with no pets.

I will ship safely and insured via Reverb with the default signature required; thanks for looking.

Please feel free to ask any questions.

### From the manufacturer

Dual Envelope Generator + LFO

The 540 Dual Envelope Generator and LFO (low frequency oscillator) is a multi-purpose modulation source. This unit features two independent ADSR (attack, decay, sustain, release) envelope sections that produce variable voltages for controlling other Eurorack format synthesizer modules such as oscillators, filters, and VCAs. Each section can be triggered externally, internally, or manually with dedicated jacks for each envelope, as well as an inverted output.

Additionally, the 540 includes a voltage controlled LFO with 5 waveform outputs. Front panel controls adjust both frequency and delay time of the LFO start. Delay and reset can be triggered from either envelope 1 or 2.

Controllers:
ATTACK slider
DECAY slider
SUSTAIN slider
RELEASE slider
MANUAL switch
FAST/SLOW switch
EXTERNAL/CYCLE switch
KEYBOARD TRIGGER switch
DELAY TRIGGER switch
FREQUENCY RANGE switch
FREQUENCY knob
DELAY knob

Connectors:
EXTERNAL jack: Miniature phone type
ENVELOPE 1 jack: Miniature phone type
ENVELOPE 2 jack: Miniature phone type
INVERTED ENVELOPE jack: Miniature phone type
CV FREQUENCY jack: Miniature phone type
SQUARE WAVE jack: Miniature phone type
TRIANGLE WAVE jack: Miniature phone type
SAW WAVE jack: Miniature phone type
INVERTED SAW WAVE jack: Miniature phone type
SINE WAVE jack: Miniature phone type