Traffic

Traffic

This script is inspired by Jasmine & Olive Tree’s Traffic. Instead of 3 trigger inputs, this version only has 2.

Traffic has 3 output channels (cv1-cv3), which output CVs signals. The value of the output signal depends on:

1. which input the trigger was received most recently and
2. the gains for that trigger on each channel.

For example, suppose the gains for channel A are set to [0.25, 0.6]. Whenever a trigger on din (trigger input 1) is received, channel A (cv1) will output MAX_VOLTAGE * 0.25 = 2.5V. Whenever a trigger on ain (trigger input 2) in received, channel A will output MAX_VOLTAGE * 0.6 = 6V.

The same occurs for channels B and C on cv2 and cv3, each with their own pair of gains for the two inputs.

Changing the gains will immediately update the output value, if the gain for that input is active. i.e. if din last detected a trigger, changing the gains for din on channel A/B/C will affect the voltage on cv1/2/3 immediately.

cv6 outputs a 10ms, 5V gate every time a trigger is received on either input.

cv4 and cv5 have no equivalent on the original Traffic module, but are used here as difference channels:

• cv4 is the absolute difference between cv1 and cv2
• cv4 is the absolute difference between cv1 and cv3

For a video tutorial on how the original Traffic module works, please see https://youtu.be/Pn7_NCCKcJc?si=OJ78FRa9PvjD8oSd. The functionality of this script is very much the same, but limited to two input triggers.

Setting the gains

Turning k1 and k2 will set the gains for channel A. Pressing and holding b1 while rotating the knobs will set the gains for channel B. Pressing and holding b2 while rotating the knobs will set the gains for channel C.

The gains for channels B and C are saved to the module’s onboard memory, and will persist across power-cycles. The gains for channel A are always read from the current knob positions on startup.

Note that this each channel makes used of “locked knobs.” This means that when changing the active channel by pressing or releasing b1 or b2 it may be necessary to sweep the knob to its prior position before the gain can be changed. This helps prevent accidentally changing the gains by pressing the buttons.

I/O Mapping

I/O	Usage
din	Trigger input 1
ain	Trigger input 2
b1	Hold to adjust gains for channel B
b2	Hold to adjust gains for channel C
k1	Input 1 gain for channel A/B/C
k2	Input 2 gain for channel A/B/C
cv1	Channel A output
cv2	Channel B output
cv3	Channel C output
cv4	Channel A minus channel B (absolute value)
cv5	Channel A minus channel C (absolute value)
cv6	10ms, 5V trigger whenever a rising edge occurs on ain or din