Aethon

The Aethon Polysynth is a digital synthesizer effect found exclusively in the Fender Tone Master Pro multi-effects unit. It emulates classic polyphonic synthesizer sounds, allowing guitarists to create lush, layered synth textures directly from their instrument. The effect offers adjustable parameters such as waveform selection, filter cutoff, resonance, envelope shaping, and modulation, enabling a wide range of synth tones from vintage analog pads to modern electronic sounds. Its integration within the Tone Master Pro provides seamless control and flexibility for live performance and studio use.
Fender Model Guide
A streamlined polyphonic synthesizer that combines expressive filtering, modulation and pitch control with responsive tracking for dynamic synth textures and evolving tones.
- PRESET Selects from a list of factory presets designed by Fender specifically for this synth. Any preset modified by the user will revert to showing “Custom” in the preset list.
- ATTACK Adjusts attack time of synth notes. Set to 0 for plucky transients; turn up to engage swell on note onsets.
- CUTOFF Adjusts cutoff frequency of the synth’s internal lowpass filter.
- RES Adjusts resonance or Q-factor of the synth’s internal lowpass filter.
- ENV Sets depth that filter cutoff will increase due to the energy envelope of the guitar signal. Set Cutoff to a low value to make the envelope action more obvious.
- SENS Sets sensitivity of the energy envelope tracking. Higher values will cause filter cutoff to move more responsively to the input. Lower values will have less movement of the filter cutoff.
- WAVE Selects synth oscillator waveform shape.
- W PITCH Adjusts oscillator waveform pitch.
- PITCH WHEEL Provides a control for manually sweeping pitch by an octave both upward and downward. TIP: Connect an expression pedal to this control for on-the-fly synth pitch bends.
- FREEZE MODE Select operation mode for synth freeze functionality. Refer to Arctic/Antarctic Sustainer guide for more info on how to use this feature (pages 95-96).
- FREEZE Engages freeze functionality to capture current synth signal and sustain indefinitely (works differently in different modes).
- GLISS Adjusts pitch slide time between frozen synth sounds.
- LFO SHAPE Selects low-frequency oscillator waveform shape.
- LFO TARGET Chooses destination for LFO modulation to target. Options include filter cutoff, synth pitch and synth volume.
- SPREAD Adjusts synth output stereo field.
- LFO DEPTH Adjusts modulation depth applied by the LFO.
- LFO RATE Adjusts speed in Hertz of the LFO.
- LFO TAP DIV Sets note division applied to the LFO rate. This syncs to the BPM setting of the TMP.
- MIX Adjusts blend between guitar and synth signals.
- VOLUME Adjusts synth master volume.
From the Fender Tone Master Pro Model Guide
- Based on
- Tone Master Pro Exclusive Aethon Polysynth
- Effect type
- Synth
- Real gear released
- 2025
Unofficial fan reference by Worship Calling. Not affiliated with or endorsed by Fender. Tone Master Pro is a trademark of Fender Musical Instruments Corporation. Other product names belong to their owners and are used only to identify the gear each model is based on. Details are a guide, so check the Fender manual for exact controls.
