A totally analog envelope filter (auto-wah) for guitar effects pedal freaks only – it is both complicated and difficult to work with due to its random nature. With the overwhelming number of parameter controls, it opens up huge possibilities when it comes to creating unique guitar tones. The pedal also has an effects loop which is quite rare. We can configure the filter with six regular potentiometer knobs and four rotary switches.
SENS – sensitivity,
ATTACK – the speed of the filter onset
DECAY – the length of the filter,
INTENS – the intensiveness of the effect
COLOR – the resonance frequency
BLEND – the balance between the dry and effected signal
The four rotary switches provide the ability to regulate a direction of the envelope, a frequency of the modulation, a mode of filtering (high-pass, band-pass and low-pass) and to turn off the envelope detector completely and use the pedal as a static filter. There is literary no limit on the number of possible setups – MeatBall* can be used for recreating many recognizable tones, from subtle modulations to wild, swooping and synth-bass experimental sounds. Famous guitarists who use it include Edge from U2 and Kirk Hammet from Metallica – we can hear it in the opening riff of „I Disappear”.
I prepared this effects pedal with great care and tried to make everything true to the original, apart from boosting the input signal just a tad. If I stuck to the initial level it would be difficult to regulate the tone correctly with guitars which don’t provide a high-level from pickups. With my modification of the circuit it is easier to achieve the wah sound. In this construction, I have used a set of LDRs and green diodes which are identical to the original ones and determine the final sound of the pedal.
- Requires stabilized 9V power supply (2.1/5.5 plug with “plus on the outside”)
- Under any circumstances shouldn’t be used with power supply higher than 9V.
?The level of guitarist’s experience on a five-point scale. The higher the level, the more skill the pedal requires.