API Select TranZformer CMP Compressor Pedal Feature Proprietary API 2510 OpAmp Signature API output transformer Adjustable attack and release times Wet/dry blend control Selectable feedback/feedforward compressor styles Buffered bypass The API Select TranZformer® CMP incorporates API's legendary VCA-type compressor circuit into a versatile and compact guitar effects pedal. Designed to easily fit into your pedal board and engineered to run off standard 9V power supplies, the CMP gives you classic studio-quality compression right at your feet. Other features include a buffered bypass in/out footswitch, adjustable attack and release times, wet/dry blend control, selectable "feedback" and "feedforward" compressor styles, transformer output, and of course the classic API sound. Specifications Input connection: 1/4" Hi-Z unbalanced instrument input Input Impedance: 1MΩ Bypass: Yes, buffered, 0dB Output connections: 1/4" Hi-Z unbalanced output Output Impedance: Hi-Z output: Less than 1kΩ Input Gain Control: 9dB - 30dB, Variable Output Level Control: -inf. to 0dB, Variable Maximum output level before clipping: +15dBu (9VDC) +22dBu (18VDC) Frequency Response: +0dB, -1dB, 20-20kHz Compressor: Ratio (Sustain): Varies from 1:1 to 20:1 depending on compressor control setting.Attack (switched): FAST (1ms) or SLOW (10ms)Release (switched): FAST (300ms) or SLOW (1s)TYPE (switched): New (Feed-forward), OLD (Feed-back) Power Supply: 9-18VDC @ 100mA Size: 4.6" x 3.8" x 3" Size (Boxed for Shipping): 6" x 4.5" x 4.5" Actual Weight: 1.5 lbs. Shipping Weight: 2 lbs.