BeetTweek

Force Feed-Back Eurorack DSP Module

BeetTweek is a Eurorack format DSP module that introduces haptic feedback control to eurorack. The module's force feedback knob responds to incoming CV signals by generating tactile pulses, creating a direct physical connection between control voltages and user interface. Knob position, rotation velocity, and force parameters output CV signals that can be patched to other modules, enabling complex feedback loops and interactive control schemes within your rack. The module features multiple operational modes and configuration variants, enabling force feedback musical interaction with your rack!

Modes:
The following are the modes that can be selected. Some modes are still in the planning and development phase, and if not finished by the end of the Kickstarter, will come out as firmware updates later.

Modes can be selected by pushing the MODE button and then subsequently selecting one of the 8 front panel buttons representing the available modes. Once selected, the module will switch to that mode. Most modes have adjustable parameters, these can be controlled by pressing the FUNC button and then pressing a button. This will adjust a parameter of the Mode, usually pertaining to the button's corresponding input or output. Pressing a button without the FUNC modifier will cycle the characteristics of the input/output.

Turn-Table (DJ) Mode – In this mode, the Haptic Knob acts as a DJ turn table. The table can be spun forward and backward to scratch the recorded sound sample or produce LFO signals. The table spins in sync with an external clock. There are 8 beat markers around the table, and when the HEAD reaches a beat marker, a pulse is emitted. The table can also be spun at a custom speed and the knob will retain it. A direction input sets the table turn direction. The Table can also record and playback audio signals, the Record/Playback input dictates whether to record, overdub or playback.

Spring Mode – In this mode, the Knob will always spring back to a given Input (CV) rotation. The Output corresponds to the current knob rotation, velocity, and torque force. On its own this is a great way of temporarily “overriding” an external module parameter while knowing it will return to its original location. (Good for “solo” parts of a song”). By giving the module an input CV signal, the “target” or equilibrium rotation of the spring will change. This can be a great way to feed in a kickdrum GATE signal that you can feel in hand while performing.

Torque-Friction Mode – In this mode, the knob is free to spin, while the input CV signals control how much torque and friction is applied to the knob. When a positive signal is used, the knob will rotate in a positive direction, while when a negative signal is used, the knob will rotate in a negative direction. Friction Input creates friction against movement. Complex input signals can be used to generate complex forces on the knob.

Indent Mode – In this mode, the knob “snaps” to different even indented locations around the circle. The indents can be felt while adjusting, giving instant feedback as to what value the knob is currently at. Outputs correspond to knob position. Custom CV or Volt Per Octave Voltages can also be stored in each indent, allowing recall of individual voltage values. Outputs also include outputting the voltage stored in the current indent.

Ratchet Mode – The knob rotates one way freely but not the other. Output CVs correspond to how much force you exert on the knob that is in the opposite of the ratchet direction. Input CVs adjust the ratchet follow trail, and direction.

Sequenced Pluck Mode – In this mode, the module is fed a series of V/OCT note data. As the notes stream in, they appear as dots on the LED ring. The knob can then be used to “Pluck” the notes as the indicator runs over each note. Each Pluck can be felt in your hand. As each note is plucked, an output note is generated. The pluck action can be dynamically muted on another input. The notes can also be rotated around the knob in sync to a beat by using a clock GATE input as well.

Torque-Curve Mode – In this mode torque is applied to the knob from a given input signal synchronized by a GATE signal. Any signal received while the GATE is ON is applied radially about the knob, forming a custom realtime waveform. Custom waveforms can be fed in from other modules. This mode can be used to create custom torque regions based on musical parameters.

Clocks Mode – enables use as a sample-accurate performance clock generator with haptic pulse feedback as the user twists the knob. Output clocks are generated from the INPUT clock , and timing is warped by twisting the HAPTIC KNOB. Turning the knob to the right increases the clock speed, turning the knob to the left decreases the clock speed. The rhythm from the output clock can be felt as pulses when the knob is turned right, and the source clock pulses can be felt when the HAPTIC KNOB is turned left. Releasing the HAPTIC KNOB to center will synchronize the OUTPUT clocks with the INPUT clock. The output clock is visualized around the Knob Indicator as rotating ORANGE dots. Synchronized with the output.

Gesture Recording/Playback
BeetTweek has a common interface for recording movements (gestures). While recording, the current mode behaves as normal while the module records your actions twisting the knob. When playing back, your actions are played back and the knob spins accordingly. Playback is synced with the external CLK input. Playback and recording can be controlled by external CV using the Z (Record/Playback) input or by pressing a button.

Specifications:
- High Precision AS5048A 14-bit rotary sensor
- Smooth 3-phase brushless motor provides haptic force feedback
- 4 24-bit DC-Coupled Audio Outputs, Low Pass Filtered
- 4 24-bit DC-Coupled Audio ADC Anti-Alias Filtered Inputs
- 80 RGB Knob Ring Indicator LEDs. With 8 Center LEDs
- USB Programmable (Firmware Updates) with Custom Cross-Platform Software
- Fast 480MHZ Cortex-M7 Primary Processor and 168MHZ Cortex-M4 Knob Processor
- 8 RGB LEDs for inputs and outputs showing function depending on the current mode
- Mode, Function and 8 menu/input-output Buttons
- Reverse Voltage Protection (Backwards Eurorack cable protection)
- High Quality Laser Engraved Aluminum Front Panel
- Custom Chem-film coated and protected CNC milled knob
- Max Voltage Range: -8V to 8V inputs and outputs
- 12V: 280mA
- 5V: 0mA
- -12V: 1mA
- HP: 10

Some Reviews:
“This module always brings a smile. Functionality that’s a hoot to play and play with. It’s becoming such that I always find a way to incorporate it just so I can wiggle with LED and haptic feedback.” – Lagrange, modwiggler

“I’m still entranced with the Torque Mode patch I made 5 days ago! So much joy! I guess I’ll abandon it to install the new FW. :-)” – TumeniKnobs, modwiggler
]

https://submatrixaudio.com