Analog and Trigger Sequencer, 2 rows
of 8 steps with knobs and 2 rows of 8 steps switches
Features of the analog rows (knobs):
- 8 potentiometers (knobs)
- lower row: Scale (knob), upper row: 1V/2V/4V (octave
range switch for exact VCO control)
- Glide time (knob), same as portamento or slew
limiter
- Glide Control (control input for switching glide
on/off)
- S&H Control (control input for internal S&H,
works like A-148)
- Pre Glide/S&H-Out (analog output before S&H
and glide unit, especially required when external audio signals are used as inputs of the
lower row)
- Post Glide/S&H-Out (analog output after S&H
and glide unit)
- lower row: external inputs for the 8 steps (switched
jack sockets), control signals or audio signals may be used as inputs, the knobs of the
lower row are working in this case as attenuators
Features of the trigger rows (switches):
- 4 Trigger/Gate tracks with 2 rows of switches
- toggle switches of 1-0-1 type (with middle
position), which can be used to send a trigger/gate to the track above or below or to send
no trigger/gate (middle position)
- 3 trigger rows (i.e. short pulse for each step set,
pulse width corresponds to the pulse width of the clock/step input signal)
- 1 gate row (i.e. a high signal is applied during the
length of the step set)
Control inputs and buttons:
- Step (defines the tempo of the sequence, same as
clock or trigger input)
- Reset (resets all rows to step 1)
- Start (starts the sequence at the momentary
position)
- Stop (stops the sequence at the momentary position)
Step and Reset are compatible to the MIDI
interface A-190, i.e. in combination with the A-190
the A-155 may be synchronized via MIDI. The quantizing module A-156
can be used to quantize the infinite analog voltages coming from A-155
into discrete semitone steps (multiples of 1/12V). Without MIDI interface
e.g. a LFO rectangle output can be used to define the tempo of the sequence.
For more detailed information please look at the English user's guide
alternatively as html file (for browser
view) or as pdf file (for printout).
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