API Select TranZformer CMP Manuel utilisateur
The API Select TranZformer®
CMP
provides unsurpassed sonic sculpting by incorporating key elements of a
legendary API 527 VCA-type compressor circuit into a versatile and robust guitar effects pedal. 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.
SIGNAL FLOW (from right to left): Input > Sustain > Blend > Transformer Output
AUDIO CONTROLS
1. INPUT: Input level; +9dB to +30dB; More gain creates more compression
2. SUSTAIN (compression): Determines amount of compression (gain-reduction); Higher levels provide
more compression (lower threshold)
3. BLEND: Mixes the dry (uncompressed) signal with the wet (compressed) signal.
4. OUTPUT: -inf. to 0dB output level control; 0db (no cut) is fully clockwise
SWITCHES
A. ATTACK: Sets the compressor’s attack time to either FAST (1ms) or SLOW (10ms)
B. RELEASE: Sets the compressor’s release time to either FAST (300ms) or SLOW (1s)
C. TYPE: Selects between feedback (OLD) or feedforward (NEW) compression styles
D. BYPASS: Buffered bypass footswitch
E. Indicator LED is illuminated when pedal is engaged
CMP
GUITAR PEDAL USER GUIDE
1
2
3
4
A
B
C
D
E
INPUTS & OUTPUTS
SETUP
Apply power using an external power adapter (sold separately) or an output tap of a pedal board power
distribution system.
Plug a cable from the instrument output into TranZformer CMP INSTRUMENT INPUT.
Connect the OUTPUT to an amplifier input or the next pedal in your chain.
USE Starting settings: Engage footswitch, set INPUT, SUSTAIN and OUTPUT controls to 12 o’clock and WET/DRY
control fully clockwise (WET).
Adjust INPUT to set input level to the compressor; Higher input level creates more compression at a given
SUSTAIN setting; Reduce INPUT to avoid clipping if needed.
Set SUSTAIN as desired for increased compression, perceived loudness, and punchiness.
Adjust the ATTACK and RELEASE controls; A FAST attack setting begins compressing the louder signals
sooner and a SLOW attack time takes longer. A FAST release setting quickly stops compressing the
louder signals whereas a SLOW release time takes longer.
Set the TYPE switch to either NEW or OLD; NEW mode uses feedforward compression and gives a more-
modern compressed tone. OLD mode uses feedback compression and provides a smoother, more-vintage
character.
Adjust the BLEND control to set the final output mix; Moving the control clockwise towards WET mixes
more of the compressed signal into the output. Moving the control counterclockwise towards DRY mixes
more of the uncompressed input signal into the output signal. Fully counterclockwise is 100% DRY and
fully clockwise is 100% WET.
Set the OUTPUT control to achieve the desired final output level going into the amplifier or the next pedal
in the chain. (NOTE: Does not reduce clipping of internal signal.)
API, TranZformer, and the
API ‘spears’ logo are
registered trademarks of
Automated Processes, Inc.
CONNECTIONS
1. INSTRUMENT INPUT:
¼” hi-Z (1MΩ), unbalanced
2. POWER INPUT:
Uses 9V to 18V DC Negative
Center
2.1mm x 5.5mm barrel
connector
Do not use more than 18VDC
3. OUTPUT:
¼”, unbalanced
1
2
3
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