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Summary of Contents for AMT Analoger APH-12
- Page 1 Analoger™ APH-12 100% Analog 12 Stage Envelope Phaser User Manual Revision A2 Last Revision 04/07/2025...
- Page 2 Introduction Thank you for your purchase of the Asheville Music Tools Analoger™ series APH-12 Dynamic Phase Shifter: The Purple Phaze. The Analoger Series APH-12 is a 100% analog 12 stage phase-shifter with deep functionality in a compact footprint. It delivers not only classic phaser tones, but many features and sounds not normally associated with traditional phasers.
- Page 3 Hawker’s Log: The story of the Purple Phaze Taking nearly 3 years to develop, the APH-12 has been the most challenging design to date for Asheville Music Tools. A 12-stage phaser has been our most requested product, yet I really didn’t know what I could bring to the table to make it special.
- Page 4 smaller affordable parts that we had not used before to try. But after many months I came to the sad conclusion this was not going to work, and I scrapped the design before it even saw prototype. Scrambling now, I decided to risk trying a filter IC that was really intended for something completely different.
- Page 5 Hawker’s Log: What is all this Phasing stuff anyhow? Artwork, Phase Shifting vs Flanging, and those Phunky Phasing Philters. The APH-12’s graphic pays homage to Hendrix, the technical aspects of phasing, guitar and the mathematical symmetry of music. Or in the words of our artist, Bryan Aiken: “It's our intention in the visual language of the pedal to lean into the science of sound, and how the function of the pedal uses that science to...
- Page 6 the signal. It creates cancelations and peaks in multiples of the delay time. Frequencies half the cycle time are canceled out, while frequencies the same as the delay time are enhanced. The key point is that, within a flanger’s circuit, all frequencies get the same delay time and this produces comb notches in linear multiples.
- Page 7 Phaser Stages The APH-12 has 12 stages of all-pass filters with 8 different stage selection options. Even numbered stages are in phase, while odd numbered stages are out of phase. 1-Stage 5-Stage High-pass filter, Env mutes, faux tremolo Vocal animated sounds 2-Stage 6-Stage Focused Notch Filter;...
- Page 8 Setup For all Asheville Music Tools products, use only a standard, 9 to 9.8VDC REGULATED, 2.1mm x 5.5mm, center-negative power supply from a reputable vendor. The APH-12 power supply should be rated for at least 200mA. Vintage style rectified & filtered, unregulated supplies are not suitable for use with this pedal.
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Page 9: Getting Started
Set STAGES switch to 4 or 6. Set MIX switch to the middle and MOD switch up. Set EXP switch clockwise to AMT. This represents a classic Phaser sound. There is no way to damage the APH-12 through knob settings, so feel free to have some fun exploring. -
Page 10: Operation
Operation The APH-12 is laid out in homage to classic modular synthesizers with three main modules. They are the PHASE, LFO (Low Frequency Oscillator), and DRIVE / STAGE Modules. Looking closer: PHASE MODULE, MIX SWITCH SWEEP: The SWEEP knob is similar to the PHASE or MANUAL knob on other phasers. - Page 11 LFO and ENVELOPE MODULE The Low Frequency Oscillator (LFO) module is a sine wave or envelope modulation source for animating the SWEEP control, providing movement and animation of the filters. Our LFO produces exponential, sine wave, octave-symmetrical modulation (instead of linear or Hz symmetrical).
- Page 12 MODULATION SWITCH: Selects the source of modulation: slow LFO, fast LFO, or an ENVELOPE follower, which rides the dynamics of your playing. Up is a slow bi-directional sine wave of about 1mHz to 2.3Hz, which is great for slow classic phaser sounds. Middle is faster, or about 0.3Hz to 78Hz, with a sweet spot in the vibrato and faux- Leslie range and some borderline ring modulation sounds at the top.
- Page 13 DRIVE and STAGE MODULES The DRIVE and STAGES modules provide further shaping of your tone and control of the phasing sound. DRIVE: The DRIVE knob is an evolution of the Analoger series preamp and drive circuits. It sits somewhere between the ADG-1 and AFG-1 in terms of color and compression.
- Page 14 4 front panel knobs you wish to control. Note: we recommend setting it to AMT if not being used. Use a standard 10-50K expression pedal that uses the +5V voltage supplied on the ring jack and outputs the control voltage on the tip.
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Page 15: Specifications
Specifications: Type: 100% Analog signal, modulation and control path • Stage options: 8 Total, 1-12 stages: 1-6, 9, 12. Odd # = out of phase. • SWEEP Range: Center 25Hz to 10kHz typical. 3Hz to <50kHz with • use of LFO, Envelope or external Control Voltage. RESONANCE: Off to self-oscillation using EXP input coupled with •... - Page 16 APH-12 Presets: Let’s try out some sonic exploration of the APH-12 and it’s all-pass filtering. The presets here range from classic phaser to far-out freak out and funky vibes. Some of these sounds may be surprising to hear from a phaser. Remember kids, since analog circuits have some variability, the exact knob setting may be slightly different from those shown below.
- Page 17 Crimson and Clover: Did you know that a single stage Phaser resembles a high- pass filter? This setting makes great tremolo or palm mute sounds. Great for spaghetti western vibes too. Again, dialing in SWEEP & AMOUNT perfectly are the keys to getting this to sound right. IKO IKO: Ready for some rhythmic funk? Great with picking as well.
- Page 18 AM Radio: Don’t forget to explore tones without modulation. Picking the stage count and SWEEP makes some great fixed filter sounds. Try this AM radio sound harkening back to those cheap plastic am radios with small speakers your parents brought to the beach. You Shall Not (All) Pass: A bold take on the fixed filter sound with an intense resonant notch.
- Page 19 BYO Preset #1: BYO Preset #2: BYO Preset #3: BYO Preset #4: <19>...
- Page 20 Tools To Inspire Your Creative Muse WWJimmyDo The APH-12 is dedicated to Phill Lesh, whose passing touched me dearly while drawing this PCB layout. “A box of rain will ease the pain And love will see you through” Proudly Designed, Manufactured, Machined & Assembled in the mountains of Western North Carolina Changelog...
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