![]() ![]() The curve changes, starting from the moment that you play the note and until it fades out, or until you play the next note. The word “envelope” refers to different EQ curve “shapes” of the guitar or bass tone. Video can’t be loaded because JavaScript is disabled: Pour Over Envelope Filter | Effects Pedals | Fender () But the envelope filters, or just filters, are the names given to specific types of pedals. Higher frequencies, and the so-called “band-pass” that letsĮQ pedals are technically filters, with multiple frequency range controls on it. We also have high-pass filtering that passes only the Signal’s audible spectrum go through, while the others are filteredĪlso heard about low-pass filters, that allow only the bottom-end of Suggests) filters out certain frequencies. Filters feature a circuit that (as their name Things up, we first need to sort out what “filtering” inĪudio processing means. An envelope filter also reacts to the dynamics and attack of your playing enhancing the intensity when plucking hard or decreasing it when playing softer. Quack, phuncnosis and DOD FX25/B type filters are closer to what I would consider "funk".Within the vast world of guitar effects, you may have come across an envelope filter pedal?īut what is an envelope filter? And what does this pedal do to our sound when added to our pedalboard? Here’s all you need to know…Īn envelope filter works by filtering out specific qualities of the audio signal either to add or remove high or low frequencies. The State Variable Filter based EF's like the Neutron and McMeat are what I would call "smooth" and "synthy" sounding. ![]() I had the Phuncnosis built on my breadboard once. Just think about an envelope controlled Crybaby. I think this route best fits your description of "somewhat distorted". To convert it to an EF, you only need to add an envelope follower (like on the EF440) and take a tap from the input buffer to drive it. If you have a BH, there is plenty of room inside the box to add all kinds of circuits. This circuit is pretty much a crybaby that is controlled by an LDR. Unfortunately there are a lot of inaccurate schematics for this floating around the internet.Īnother experiment I tried was to convert the Morley Bad Horsie into an envelope filter. You could look for a schematic for the FX25 and I could show you some of the mods. That kind of circuit leaves a lot of flexibility for tweaking with minor parts changes. It only took some minor mods to become good sounding and flexible. I would have to study the filter topology more to see if it could be done without adding many parts, but I think a direct filter gain increase would also increase the filter resonance (which may not be what you want).Īn experiment I tried a while back is I bought a DOD FX25 envelope filter for $25 off eBay. One could mitigate the volume drop by building a booster circuit onto the output of the filter. I'm not sure of your level of experience, but if you're sort of new to this, the Phuncgnosis is going to be easier to build than the Neutron, and though it's not as flexible, it can be quite satisfying, especially since you can tweak it to your needs. If you have a breadboard, this is definitely a good circuit to play around with and tweak. Try nearby values such as 820 pF and 1 nF to start. I'm not absolutely certain about the 1-stage filter in the Phuncgnosis, but I think that to make it more midrangey, you can increase the two 680 pF caps. If it's too trebly, increase the values of those capacitors too bassy, decrease the values. The great thing about this is that it makes it pretty easy to tweak the circuit to give you a sweep over a range that you like. Looking at the Neutron schematic, for example, C6 and C8 are in the circuit when the range switch is in the "high" position, whereas the "low" position puts C5 and C7 in parallel with C6 and C8, respectively, making for larger total capacitances, and filters that sweep over a lower range of frequencies. The question of the range of the filter has more to do with the capacitors in the feedback paths of the op-amps that are actually doing the filtering. This is the easiest way to go, but I'm sure you could also achieve a good result by "rolling your own" with 2 LDRs and an LED. I built one of these using the dual-LDR optocoupler available from Small Bear. ![]() My understanding is that in practice, the photo-FET optocouplers can be fiddly, and that it can be hard to get rid of envelope ripple in the decay. Ideally, all of the optocoupler options should sound the same. ![]()
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