How to use Equalizer APO on a bass guitar singal going through a multieffects pedal
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I am using a multieffects pedal for my bass guitar (listening through headphones) and would like to be able to use Equalizer APO for the bass guitar signal. However, the pedal is plugged into my laptop via usb and when I use the pedal on the laptop, everything heard on the laptop is going through the pedal and then to my headphones. That way I can hear anything on the laptop, like a song, together with my bass guitar and I can then play along. That means that there are basically two channels, the audio from the laptop and the bass guitar itsself.
However, when I use Equalizer APO it is only applicable to audio coming from the laptop, like any song for example, but not on the signal of the bass guitar. I have installed the device that is supposed to allow APO to be applied to the bass (which is called the IN signal, the audio on the laptop being OUT), but it still does not respond when I select that device. It is displayed as a capture device though when I installed it. Does anybody know how I can use Equalizer APO on the bass guitar channel?
Your config.txt file would be helpful.
Do you enable your EqAPO filters for input device (Device: your pedal name string (see. example found in https://sourceforge.net/p/equalizerapo/wiki/Configuration%20reference/ ) ?
An alternative could be using Voicemeeter (Banana) for pedal input (! ASIO/WDM/WASAPI device is a must to get the latency stay reasonable). I can't test this for you b/c of using Ubuntu ATM) ... EqualizerAPO v. 1.2x is needed for Voicemeeter cooperation.
Last edit: Juha 2017-09-17
I'm really sorry but I have no idea what any of that means to be honest, I am really not advanced with the program. I have selected the device which is called ''IN.GTB10B'' (the pedal is a boss gt10b) in the section where you must choose a device and as I said it was depicted as a capture devide before I installed it. However APO does not respond to it and it still picks up the audio of the laptop instead of the bass guitar, even if the correct device (IN.GT10B) is selected. I have installed the device though so I find that strange.
I quess you have your headphones connected to pedal rather than to laptop. Could it be that the headphone output there takes the pedal line input directly (direct monitoring)? Any switch (or control panel option) for direct monitoring there?
Does anything get changed if you connect your headphones to the laptop and set the playback to be done throug it (onboard audio codec). Be sure your bass signal can be heard then.
Nothing changes when I set the playback through the laptop. All that I notice in every case is that the program just does not seem to pick up my bass guitar as a capture device even though it is installed and shows up in the device list. If I select it, the program still picks up the sound of anything that happens on the laptop, and does not allow me to use the sliders on the bass guitar, nothing happens if I mess with the sliders. It just seems like I need to change something in order for the program to pick it up or select that signal but I don't know what.
Last edit: Dino Basic 2017-09-23
Dunno where you go wrong since I have tried this type of setup (not BOSS gear) and it worked but well only when input was taken through Voicemeeter Banana.
https://static.roland.com/assets/media/pdf/GT-10B_OM.pdf
Have you looked the chapter 7 ?
If you look the diagram showen there in page 97, you'll notice that turning the "direct monitoring" OFF routes the signal to go through USB I/O ... which means if you use certain type device driver API you should be able to use EqualizerAPO filters for that signal normally. Remember that driver APIs like ASIO/WDM-KS and WASAPI Exclusive bypasses the APO layer.
It is normal that you hear everything played in laptop if you have those sources set to use the default playback device (it's common that after connecting an USB audio device it becomes the default I/O automatically). If you don't want other audio but your bass playing come out from the BOSS then just set the system to use onboard audio as default play/rec device and set your filters for BOSS only.
Your problem would be that you need to enable those effects just for the bass ... i.e. not for the background music you're listening while playing bass. AFAIK, you should be able to set Device: -command to use filters for input device only. Another possible problem is latency (delay) between played audio and bass playing ... .
In your case, instead of routing through windows APO layer I would use software which are dedicated for this kind of use you're doing there.
Last edit: Juha 2017-09-24