Tiptop Audio Buchla Model 258t

Tiptop Audio Buchla Model 258t

Dual Oscillator Model 258t

Two independent voltage-controlled oscillators. Each has one processing input, a frequency modulation input and a 1V/oct input.
Waveshapes, as well as frequency, can be voltage controlled. Model 258 oscillators feature low sine wave harmonic content, negligible settling error, and high short and long-term stability, even with rapidly changing ambient temperatures.

TRIMMERS:
There are three trimmers for each oscillator on the back of the module:

• 1V/oct is the octave tracking trimmer and is set at the factory using high precision instruments.
• SHAPE is the trimmer that set the sine wave, for the lower harmonic content of the sine wave.
• VC WAVE SHAPE sets the response of the waveshaper to the incoming control voltage. Both SHAPE and VC WAVE SHAPE
  trimmers are used to adjust the sine wave purity.

Processing input:
The processing control attenuverter input permits control of pitch scaling/inversion/expansion without the need for a separate external processor.

Frequency modulation control:
For adjusting vibrato depth or creating clangorous or bell-like tones, rich in non-harmonic upper partials.

Processing control:
Used to set desired range of incoming control voltage for expansion, compression and inversion.

1V/Oct input:
Control Voltage input for 1V/oct note tracking.

Waveshape control input:
Waveshapes can be varied from sine to saw (OSC 1) and sine to square (OSC 2). Voltage control of waveshape enables powerful dynamic control of timbre.

Oscillator frequency control:
Spans the audio spectrum of 5 Hz to 20 kHz with no range switching.