From the original SynthMaker forum (2004–2014), with its members’ names and dates.
infuzion ·
I'm sure this is how SM's Parametric EQ has always been, but I've just discovered this while working on a major payed project, so I need a solution ASAP please. Example file:
Steps for the bottom knob:
1: Shrink the Q (blue square on horizontal bar) to the narrowest. You should see the top Float approach 7.81034, & the bottom approach 0.0413793.
2: Enlarge Q, top shrinks to 00.5 & stops there for a bit while the bottom Float reaches 0.95 to 1.0...
3: Keep enlarging the Q-bar, the top starts to grow again, while the bottom grows over 1+
Not only I'm unsure what the "real Q" is, since the graph shows the "V-line" to flatten about 1.5 on the bottom float, but also when you load a patch, sometimes a small Q will come up as a giant Q because of this bug!
BTW, the Parametric EQ seems to have never left the beta stage, despite it being in the Toolbox so long & it's cloned-inclusion of the Analog Kit. There are parts hanging off everywhere, unneeded formula notes left, superceded Timing Info used instead of the Float Sample Rate, major reduction in both the green parts & CPU% needed.
cheers
stefan ·
This seems to come down to the lack of limiting the input. The "W" shouldn't go above 1.0 afaik, and when it does, calculations go nuts. Should be enough to just clamp it to 0..1.
infuzion ·
stefan wrote: This seems to come down to the lack of limiting the input. The "W" shouldn't go above 1.0 afaik, and when it does, calculations go nuts. Should be enough to just clamp it to 0..1.
I had thought of that, but it is nice to have a huge Q sometimes, so perhaps the ratio(s) (like inside the Convert sub-module) needs to be changed a well as limiting? With the present Parametric EQ, a big Q or 2 can make a pseudo-shelving EQ. Even with the derivative I'm working on that has a actual switchable High & Low-shelf EQs, a bigger Q can make the frequency-sculpting more smoother, & sometimes can reduce the need for extra EQ points to be activated to make those smooth EQing.
I hope I'm clear here.
stefan ·
But we're talking about something quite off the charts here, no? When the input is at 1 the Q is _very_ low. I don't see why anyone would want it to go even that low.
infuzion ·
stefan wrote: But we're talking about something quite off the charts here, no? When the input is at 1 the Q is _very_ low. I don't see why anyone would want it to go even that low.
Now looking at it again, the EQ curve does not seem to change after the Preset W ([0..1] ratio) goes above 0.8, & the smallest it can go is 0.0413793... so perhaps the ratio needs to be changed to it uses the full [0..1] amount?
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