DIY Grids (Black Magpie)

Grids is an algorithmic 3-channel drum pattern generator with progressive, CV-controlled morphing through patterns (Map X and Map Y controls), and CV control over the density/sparsity of the pattern (Fill controls).

Features

Clocking

• Internal clock with a 40 to 240 BPM range.

• Beat indicator / Tap tempo button (reconfigurable as a reset button).

• External clock input, with selectable resolution (24, 8 or 4 ppqn).

• Pattern reset trigger input.

Drum Pattern Generator

Based on a compressed representations of drum patterns and their variations.

• X/Y (pattern selection) knobs with CV inputs.

• Pattern complexity/density knobs for channels 1, 2, 3, with CV inputs.

• Pattern randomization knob with CV input (reconfigurable as a swing control for the internal clock).

• 3 output channels (BD, SD, and HH/percussion).

• 3 additional outputs, configurable as Accent/Clock/Reset or per-channel accent.

• Outputs can be either triggers or gates.

Bonus features: Internal clock with tap-tempo, input clock divider, "vanilla euclidean sequencer" mode, bonus outputs (clock, reset, random pulses), DIY MIDI interface offering clock sync.

Specifications

• Width: 16hp
• Depth: 25mm
• +12V Current: 25mA
• -12V Current: 1mA
• Input impedances: 100k
• CV acquisition: 8-bit, 1kHz
• Output level: +5V
• Clock resolution and processing latency: 120µs
• Worst case jitter: < 0.5% at 120 BPM

The full DIY kit includes everything you need, and it is supplied with black and white skirted pointer knobs from Rogan.

The ATMega is pre-flashed for you with the latest firmware at the time of kitting.