buchla/tiptop audio 266t: source of uncertainty price : $299.00

offering tons of opportunity for creating unique instances of controlled randomness, tiptop audio's buchla series model 266t source of uncertainty is a recreation of the classic random voltage generator and sculpting module. bringing back a classic set of buchla's 200-series modules, the 266t recreates six different tools in one classic interface for all of the eurorack community to bask in. the 266t divides into two sections of generation and modification, featuring two different processors and four generator types with one producing three flavors of analog noise, labeled flat, -3db/oct, and +3db/oct.

the fluctuating random voltages section features two individual smooth voltage generators for adding wiggles and warbles to your modules, each controlled by a rate parameter with cv inputs for modulation. right below is the quantized random voltage, offering a stepped random output that randomly decides voltage based upon one of two equations corresponding to a value called "n". depending on the output, you can tune your range to a set amount of possibilities with n+1 output being more localized to the 5v range and the 2^n output having equal opportunity across all 10 volts. the final generator labeled stored random voltage produces two outputs of stepped voltage with an equally distributed random voltage output as well as a selectable bell distribution output that centers its options based on the probability control.

looking at the processing section, the top-right sample and hold section is actually a track and hold processor, tracking the cv input and changing only at the next high input on the pulse in. the resulting cv output additionally has two alternate outputs that base off alternative pulse counts, and the pulse output alternatives similarly alternate each pulse count. the final section of the 266t lies in the integrator, featuring a simple yet very handy smoothing processor by determining the time it takes to reach from one cv value to the next. with all this versatility to work amongst many modules or even self patch for related modulation, the buchla model 266t source of uncertainty will certainly make any modular system lively.

features:
noise source:
pink noise (-3db/oct - low frequency biased)
white noise (flat - equal frequency balanced)
blue noise (+3db/oct - high frequency biased)

fluctuating random voltages:
cv input controls the probable rate of random voltage change
knob osets the probable rate change from slow 0.05hz to 50hz
cv output of voltages with led indicating the fluctuation rate

quantized random voltage: pulse input activates a random stepped voltage at the output
the knob osets the varying number of steps from setting 1 to setting 6
cv input controls the number of steps
n+1 is more locally scaled in the 5v range
2^n is more equally distributed over a 10v range

stored random voltage:
pulse input activates a random stepped voltage at the cv outputs
the left cv output is an evenly distributed random voltage
the right cv output has a potentiometer and cv input to determine the random voltage distribution.
cv in aects the "curve" distribution of the right cv output
the knob osets the "curve" distribution of the right cv output
. fully counterclockwise skews in favor of lower voltages. the middle is a bell curve distribution and clockwise skews toward higher voltages.

integrator: input is looking for discrete or stepped voltages
the knob proportionally smooths out the incoming voltage from 0.01 (no smoothing) to 10 (dramatic smoothing, glissandi)
cv input controls the smoothing potentiometer
tr1 is a trimmer on the back of the module, it adjust the range of the integrator.

sample and hold:
pulse input samples the voltage at the cv input
pulse "alt" divides the incoming pulse into alternating pulse outputs
cv input for periodic, continuous or fluctuating voltages
cv output of the complete voltages
cv output "alt" divides the voltages into alternating outputs (great for ping pong eects)

specifications:
size: 24 hp
depth: 25mm
power: +12v 150ma / -12v 100ma

download the users manual here.