Glossary

Terms used throughout this manual. Cross-references to the longer explanations are linked.

A

Amp simulator: A device that emulates the sound of a guitar amplifier. See Devices.

B

Bank: A MIDI bank number (0–127). Each set list maps to one bank. Bank 0 is reserved for factory rigs.

Buffer: A small chunk of audio samples processed at once. See Troubleshooting.

Bypass: Disable a device without removing it from the chain. The device passes audio through unchanged.

C

Cabinet (cab): A device that simulates a guitar speaker cabinet, typically the last stage in an amp-style chain.

Category: A grouping of devices (Drive, Reverb, etc.). See Devices.

Chain: See Signal chain.

Control Mappings: The screen that lists a rig’s Rig Controls, expression pedal mappings, and MIDI mappings in one place. See Rig Controls.

Control source: Anything that drives a parameter: a knob (a Rig Control), the expression pedal, or a MIDI control change.

D

Device: A single audio processor in the signal chain, such as an amp, drive, cab, EQ, modulation, delay, or reverb. See Devices.

Dropout: A click, pop, or brief silence in the audio caused by the audio thread missing its deadline. See Troubleshooting.

E

Encoder: A rotary control on the front panel used to adjust parameters. Axion has 5 encoders.

Enum parameter: A parameter that picks from a fixed list of options (e.g. Symmetrical / Asymmetrical).

F

Factory rig: A rig that ships with Axion, in bank 0. Not editable in place; load and save-as to modify.

Footswitch: A foot-operated switch on the unit, typically used to load rigs, toggle device bypass, or trigger tap tempo. Axion has 5 footswitches.

I

IR (Impulse Response): A short audio recording that captures the acoustic signature of a speaker cabinet, room, or other space. Used by convolution cab devices to model real cabinets.

L

Latency: The time between picking a note and hearing it from the output. See Troubleshooting.

LV2: An open standard for audio plugins on Linux. Axion supports LV2 plugins as third-party devices.

M

Macro: A Rig Control that turns more than one parameter at once. The knob reads 0 to 100 %, and each target keeps its own range and curve. See Rig Controls.

MIDI: Musical Instrument Digital Interface. Used to remotely control Axion, typically with Bank Select to choose a set list and Program Change to choose a rig within it.

P

Parameter: One adjustable value on a device, such as a knob, switch, or selector.

Preset: In some contexts, the same as a rig. The term “rig” is preferred in this manual for the saved sound as a whole; “preset” sometimes refers to a saved parameter snapshot for a single device.

Program Change: A MIDI message (0–127) that selects a rig within the active set list. See Rigs and Set Lists.

R

Real-time: Audio processing that meets a strict per-buffer deadline. See Troubleshooting.

Rig Control: A binding from a dock knob to a device or system parameter, saved with the rig. Assign several parameters to one knob to make a macro. See Rig Controls.

Rig: One complete saved sound: the full chain of devices and all their parameter values. See Rigs and Set Lists.

S

Sample rate: The number of audio samples processed per second. Axion runs at 48 kHz.

Set list: A named, ordered collection of rigs, mapped to a MIDI bank. See Rigs and Set Lists.

Signal chain: The ordered series of devices that audio passes through, from input to output. See The Signal Chain.

V

VST3: A widely-used cross-platform audio plugin format. Axion supports VST3 plugins as third-party devices.