3 Band EQ

KostiX · Nov 23, 2004, 04:14 AM

Hello everybody!
This is my first post on this forum.

I have been wondering if anyone had ever written a 3 Band Equalizer plugin for the KX driver?
It would be very useful for any DJing program.
I have been using the PCDJ Red program, which allows u to send every player to a different output, aswell as the monitoring signal.

So my idea is, to have 2 virtual stereo outputs, routed to its appropriate 3band stereo EQ modules, the outs of both EQ's are going to their own Volume Control plugin, and after that the 2 stereo signals are mixed to 1 stereo , routed to an output.
this way i can build a custom midi controller, with the knobs positioned as on a real audio mixer, with the controls hooked up to the appropriate EQ, vol control, etc, plugin.

I figure this could be done using a lowpass, highpass and bandpass filters, each one of them having their own vol control plugin and then sum the 3 and add a master vol control, and this is per 1 stereo channel.
so for 2 i think there wouldnt be enough of GPR registers

so has anyone ever written a 3 Band eq ?
i know some C programming, but never DSP stuff like filters (besides getting samples from an ADC on a PIC microcontroller to read a potentiometers position).

can anyone point me in some direction ?

ok thanks in advance

ROBSCIX · Nov 23, 2004, 05:32 AM

Read the guides and try and program one..if you get stuck I would imagine the more advanced guys around here would probably give you a hand...why only 3 band?

**dj_stick** · Nov 23, 2004, 05:33 AM

DJ eq's are only three band
high, mid, low

ROBSCIX · Nov 23, 2004, 05:59 AM

Good to know.....I guess that would be easier then a whole bunch of sliders....something easy that could be trimmed on the fly?...is that the idea?

**dj_stick** · Nov 23, 2004, 06:00 AM

afaik thats the idea

KostiX · Nov 23, 2004, 06:09 AM

yeah well, there is not much use for higher band count in EQ's for DJing use

ok, so i did a little experiment, and the GPR registers were enough even when i loaded couple of more fx ..
so here's the setup:

1 Channel section:

input comes from Src, going straight to a Gain control, then the signal is split in 3, feeding a Highpass, Bandpass, Lowpass filters, the output of each filter goes to its own Vol control.. little note: the bandpass phase must be inverted for correct phase when summing the 3 eq's, so a Phase plugin after the bandpass.
every vol control is set to 50% so u can have gain and attenuation at high/mid/low.

after this the outputs of every vol control goes into the first 3 channels of the FXMix module. The other 3 stereo inputs of the FXMix are used for the second channel, same setup.

so after this, if u have a MIDI controller, u assign the same controller number/channel, for the first 3 faders of the FXMix, and this will be the Vol control for Channel 1. the other 3 are grouped aswell for the second channel.
and u can have the master fader of the FXMix assigned to another midi controller to have the Master Volume of ur virtual mixer.

ok this was for the Main Out routed to 1 stereo out of the sblive

but people who DJ, usually also need to monitor every channel in headphones without them being heard in the Main out.

so i inserted a second instance of FXMix, and the connections are the same as for the first FXMix.
now also, u group the first 3 faders and assign to a single midi Button controller, so that when u push the button, all 3 faders let pass all of the signal, and if u release the button, everything is muted
or one could even use separate vol controls for headphones monitoring of every channel.
and of course the master out of the second FXMix goes to the out where u connect the headphone amp.

what a nice and flexible control interface!
the EQ's are totally customizeable, .. maybe it would be a good idea to have another set of knobs to control every eq's freq and q.
and i wont start about FX.. just insert a plugin, patch it thru and assign midi controllers

not very portable, but a nice setup to play on i believe!

ok just my bit

Thanks for the replies

revpsilocybe · Nov 26, 2004, 01:21 AM

more of a 4 channel (2 stereo) rotary knob 3 band eq with kill switches, ideally with 24db gain/cut or a 12 gain/24 cut setup.

Check out the Mixman DM2 for a controller, you can get them on ebay for 30 bucks tops. Then d/l DM2MIDI a freeware progam that translates all the buttons/fader/wheel controls to MIDI output. I use it with Traktor to beatmix and scratch live. In tracktor you just select the approriate button that is assigned to the bass/mid/high eqs and then turn the scratch/jog wheel to gain/cut. Works pretty good except for getting them back to perfect 0.

this would be a nice dsp effect to have...

Nov 23, 2004, 04:14 AM	#1
KostiX DriverHeaven Newbie Join Date: Nov 2004 Posts: 2 Rep Power: 0	3 Band EQ Hello everybody! This is my first post on this forum. I have been wondering if anyone had ever written a 3 Band Equalizer plugin for the KX driver? It would be very useful for any DJing program. I have been using the PCDJ Red program, which allows u to send every player to a different output, aswell as the monitoring signal. So my idea is, to have 2 virtual stereo outputs, routed to its appropriate 3band stereo EQ modules, the outs of both EQ's are going to their own Volume Control plugin, and after that the 2 stereo signals are mixed to 1 stereo , routed to an output. this way i can build a custom midi controller, with the knobs positioned as on a real audio mixer, with the controls hooked up to the appropriate EQ, vol control, etc, plugin. I figure this could be done using a lowpass, highpass and bandpass filters, each one of them having their own vol control plugin and then sum the 3 and add a master vol control, and this is per 1 stereo channel. so for 2 i think there wouldnt be enough of GPR registers so has anyone ever written a 3 Band eq ? i know some C programming, but never DSP stuff like filters (besides getting samples from an ADC on a PIC microcontroller to read a potentiometers position). can anyone point me in some direction ? ok thanks in advance

Nov 23, 2004, 06:09 AM	Thread Starter #6
KostiX DriverHeaven Newbie Join Date: Nov 2004 Posts: 2 Rep Power: 0	hello again yeah well, there is not much use for higher band count in EQ's for DJing use ok, so i did a little experiment, and the GPR registers were enough even when i loaded couple of more fx .. so here's the setup: 1 Channel section: input comes from Src, going straight to a Gain control, then the signal is split in 3, feeding a Highpass, Bandpass, Lowpass filters, the output of each filter goes to its own Vol control.. little note: the bandpass phase must be inverted for correct phase when summing the 3 eq's, so a Phase plugin after the bandpass. every vol control is set to 50% so u can have gain and attenuation at high/mid/low. after this the outputs of every vol control goes into the first 3 channels of the FXMix module. The other 3 stereo inputs of the FXMix are used for the second channel, same setup. so after this, if u have a MIDI controller, u assign the same controller number/channel, for the first 3 faders of the FXMix, and this will be the Vol control for Channel 1. the other 3 are grouped aswell for the second channel. and u can have the master fader of the FXMix assigned to another midi controller to have the Master Volume of ur virtual mixer. ok this was for the Main Out routed to 1 stereo out of the sblive but people who DJ, usually also need to monitor every channel in headphones without them being heard in the Main out. so i inserted a second instance of FXMix, and the connections are the same as for the first FXMix. now also, u group the first 3 faders and assign to a single midi Button controller, so that when u push the button, all 3 faders let pass all of the signal, and if u release the button, everything is muted or one could even use separate vol controls for headphones monitoring of every channel. and of course the master out of the second FXMix goes to the out where u connect the headphone amp. what a nice and flexible control interface! the EQ's are totally customizeable, .. maybe it would be a good idea to have another set of knobs to control every eq's freq and q. and i wont start about FX.. just insert a plugin, patch it thru and assign midi controllers not very portable, but a nice setup to play on i believe! ok just my bit Thanks for the replies

Nov 23, 2004, 05:32 AM	#2
ROBSCIX DriverHeaven Senior Member Join Date: Mar 2004 Posts: 1,732 Rep Power: 0	Read the guides and try and program one..if you get stuck I would imagine the more advanced guys around here would probably give you a hand...why only 3 band?

Nov 23, 2004, 05:59 AM	#4
ROBSCIX DriverHeaven Senior Member Join Date: Mar 2004 Posts: 1,732 Rep Power: 0	Good to know.....I guess that would be easier then a whole bunch of sliders....something easy that could be trimmed on the fly?...is that the idea?

Nov 26, 2004, 01:21 AM	#7
revpsilocybe DriverHeaven Newbie Join Date: Nov 2004 Posts: 9 Rep Power: 0	more of a 4 channel (2 stereo) rotary knob 3 band eq with kill switches, ideally with 24db gain/cut or a 12 gain/24 cut setup. Check out the Mixman DM2 for a controller, you can get them on ebay for 30 bucks tops. Then d/l DM2MIDI a freeware progam that translates all the buttons/fader/wheel controls to MIDI output. I use it with Traktor to beatmix and scratch live. In tracktor you just select the approriate button that is assigned to the bass/mid/high eqs and then turn the scratch/jog wheel to gain/cut. Works pretty good except for getting them back to perfect 0. this would be a nice dsp effect to have...