

Skull_001

Skull is an 8bit pocket synthesizer and 16 step sequencer. It is the same size of one playing card. Just plug your headphones or speaker and start creating music.

Specification

Dimensions: 90 x 60 x 18 mm.

Battery: CR2032.

Monophonic synth.

8bit microcontroller.

240 notes from 16 Hz to 15 KHz in half semitones steps

2 pulse wave with variable duty cycle and detune.

1 saw wave with detune.

Attack and Release envelope.

Main Volume control.

Low pass filter with frequency cutoff control.

LFO with three waves ( triangle, saw, square), amplitude modulation control and three possible destination (pitch, dutycycle, lpf cutoff).

16 step sequencer with tempo, note duration control, rests and ties. Number of steps is controllable and the sequencer has the following modes: fwd, bwd, pendulum and random.

1 memory bank to save all the configurations of the synth.

General detune of the synth in semitones.

Possibility to retrigger the sequencer in 4 points.

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English

Skull_001 manual:

Skull_001 has a very intuitive and minimalistic interface, only two pots and 5 buttons. You can hold, single press and double press a button to enter different modes. The last button to the right is the SHIFT.

The on/off switch is on the upper left, if there is something saved the led blinks blue on start-up, if there is nothing saved the led blinks orange.

Double press:

If you double press one button you enter a menu ( led blinks), to exit single press SHIFT.

Button 1 (Double Press): PULSE WAVE 1

The first pot controls the dutycycle.

The second pot controls the detune, the first half of this pot is positive detune, the second half is negative.

Button 2 (Double Press): PULSE WAVE 2

Same as the first pulse wave.

Button 3 (Double Press): SAW WAVE

The first pot enables the saw wave, left: off, right: on.

The second one controls the detune in the same way as the pulse wave.

Button 4 (Double Press): ENVELOPE

The first pot controls the attack time.

The second pot controls the release time.

Button 5(Double Press): VOLUME and LPF

The first pot controls the volume.

The second pot controls the low pass filter cutoff frequency.

SHIFT (Hold) + Button 1 (Double Press): LFO

The first pot controls the lfo frequency.

The second pot controls the lfo modulation amount.

SHIFT (Hold) + Button 2 (Double Press): LFO

The first pot controls the lfo wave, left: triangle, center: sawtooth, right: square.

The second pot controls the lfo destination, left: oscillator pitch, center: pwm, right: lpf cutoff.

SHIFT (Hold) + Button 3 (Double Press): SEQUENCER

The first pot controls the number of steps in the sequencer.

The second pot controls the sequencer play mode.

SHIFT (Hold) + Button 4 (Double Press): SAVE AND ERASE

The first pot controls the save function, swing the pot left to right 2 times to save.

The second pot controls the erase function, swing the pot left to right 2 times to erase.

Single Press:

Button 1 (Single Press): Retrigger step 0.

Button 2 (Single Press): Retrigger n_step * ( 1 / 4 ).

Button 3 (Single Press): Retrigger n_step * ( 1 / 2 ).

Button 4 (Single Press): Retrigger n_step * ( 3 / 4 ).

Button 5 (Single Press): Stop and play of the sequencer.

SHIFT (Hold) + Button 1 (Single Press): general detune minus one semitone.

SHIFT (Hold) + Button 2 (Single Press): general detune plus one semitone.

SHIFT (Hold) + Button 3 (Single Press): increment sequencer tempo.

SHIFT (Hold) + Button 4 (Single Press): decrement sequencer tempo.

Hold:

Button 1 (Hold):

The first pot controls the pitch of step: 1.

The second pot controls the pitch of step: 2.

Button 2 (Hold):

The first pot controls the pitch of step: 3.

The second pot controls the pitch of step: 4.

Button 3 (Hold):

The first pot controls the pitch of step: 5.

The second pot controls the pitch of step: 6.

Button 4 (Hold):

The first pot controls the pitch of step: 7.

The second pot controls the pitch of step: 8.

Button 5 (Hold):

The first pot controls the tempo of the sequencer.

The second pot controls the note duration.

Button 1 (Hold) + Button 2 (Hold):

The first pot controls the pitch of step: 9.

The second pot controls the pitch of step: 10.

Button 2 (Hold) + Button 3 (Hold):

The first pot controls the pitch of step: 11.

The second pot controls the pitch of step: 12.

Button 3 (Hold) + Button 4 (Hold):

The first pot controls the pitch of step: 13.

The second pot controls the pitch of step: 14.

Button 4 (Hold) + Button 5 (Hold):

The first pot controls the pitch of step: 15.

The second pot controls the pitch of step: 16.



Skull_001: