The Bassline is a monophonic lead synthesizer loosely modelled after the legendary Roland TB-303. It consists of a single oscillator(2 waveforms) running through an envelope-modulated resonant filter, with LFO and Distortion effect. The bassline tutorial video shows how it works.
- Machine label: This is used to identify this machine in various places throughout the app. Its value can be changed via a long-press action (label changes color to indicate a successful touch). Upon successful long-press, a keyboard offering you to rename the machine will appear. Use this to identify a machine in a rack configuration where there might be more than one instance of the same machine.
- Preset LCD: This display shows the name of the last loaded preset and is used to load presets. A preset is a saved file that contains the positions of all knobs and controls. To load a preset, touch the preset LCD. This will bring up a File Browser with a list of saved presets to choose from.
- Save Preset button: This button allows you to save your own presets to disk for use later. Pressing this button will bring up a keyboard allowing you to name your preset. Presets are stored on the external storage in /caustic/presets/bassline.
- Waveform selector: Touch to change, 2 waveforms to choose from; Sawtooth and Square
- Pulse Width knob: When the waveform selector(3) is on square wave, this knob will control the duty cycle of the square wave. From 1% to 50%. Note: this control has no effect on the sawtooth waveform.
- Tune knob: Frequency tuning for the oscillator, in semitones. +1/-1 octave.
- Cutoff knob: Sets the frequency at which the filter starts to cut.
- Resonance knob: Sets the amount of resonance produced by the filter. Resonance is defined by small peaks at harmonic frequencies to the cutoff frequency.
- Envelope Modulation knob: Controls the amount of filter change during each note's lifetime.
- Decay knob: Controls the lifetime of each note.
- Accent knob: Controls the volume added to notes with the Accent(15) modifier.
- Output Volume knob: The final output volume of the bassline.
- Output VU meter: Indicates the level at which the bassline is outputing signal. If this reaches RED, then the bassline will output distorted sound.
- Low Frequency Oscillator Target: Sets which bassline configuration value is modified by the LFO (Pulse width, Filter Cutoff or Volume)
- LFO Rate knob The speed at which the LFO modifies its target value.
- LFO Depth knob: The amount of modification the LFO apply to its target value.
- LFO Phase knob: Sets the timing for the sine wave used to modulate the LFO target. This is a offset sync value relative to the song's tempo.
- Distortion Program Knob: Sets which distortion program is active (Off, OverDrive, Saturation, Foldback, Fuzz)
- Distortion Pre gain knob: Pre-amplification used to send signal past the chosen program's threshold.
- Distortion Amount knob: The amount of distortion applied to signal above the threshold.
- Distortion Post gain knob Post-amplification used to compensate the distortion algorithm's output volume.
- Mute/Solo buttons: These buttons link to the ones in the mixer and are used to cut out this machine from the final mix or listen to only this machine.
- Legacy glide button: When pressed, this button controls the glide mode of the bassline synth. Legacy mode doesn' use overlapping notes to determine glide time and is mostly offered for legacy song support.
- Preview Keyboard: This keyboard is used to play notes to help when designing sounds with the bassline.
- Octave buttons: Raises or lowers the octave of the Preview Keyboard.
- Note On LED: This LED lights up whenever a note is triggered.