Carl Martin Ottawa Vintage Optical Envelope Auto-Wah/Envelope Filter vs Electro-Harmonix Q-Tron Plus
The Carl Martin Ottawa Vintage Optical Envelope Auto-Wah/Envelope Filter and the Electro-Harmonix Q-Tron Plus are both pedals sharing dynamic. The Carl Martin Ottawa Vintage Optical Envelope Auto-Wah/Envelope Filter leans transparent. Current prices: $142.98 vs $162.43.
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Blended from circuit-archetype lineage, dynamic feel, tone-signal overlap and tone-vector distance — the tone vector itself is derived from editorial description text, not a measured acoustic signal, so this reflects how similarly the catalog copy describes the two, not a lab measurement. Shown only within a gear class, and only where there's enough evidence to be meaningful.43% — somewhat different
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Genres both listings are associated with.- Funk
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Derived from overlapping tonal signals across both listings.- dynamic
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Citation/mention fame — how often this gear is cited across artist rigs and gear discussion.$142.98via Reverb
$162.43via Reverb
The Carl Martin Ottawa is an analog optical envelope filter pedal delivering vintage auto-wah and filter sweep effects triggered by picking attack. Three selectable filter modes (High Pass, Band Pass, Low Pass) provide distinct frequency response characters. Q control shapes resonance, while Attack and Tone controls adjust filter timing and high-frequency content. Approximately 14mA current draw. Danish boutique analog construction. Produces classic funky envelope filter tones for guitar and bass without a treadle.
The Electro-Harmonix Q-Tron Plus is an envelope-following filter pedal delivering dynamic, funky tones responsive to pick dynamics and guitar volume. Its three-band EQ and mix control provide extensive tonal shaping from subtle color to dramatic expression effects. The Q-Tron Plus remains popular for creating responsive, expressive sounds in funk, rock, and experimental contexts.
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Genres this gear is documented as being used in.- Soul
- Experimental
- Rock
- transparent