I've just purchased a POD X3 Pro to use for home recording, and I've installed the latest drivers and firmware almost immediately. I've connected my headphones, a pair of Sennheiser HD650's to the headphone output, and a guitar to input 1 and started playing something, and in the headphones I can hear distinct crackling and noise, as if there's a buffer or sample rate mismatch. The same thing is when I use it for monitoring as my primary sound card when playing from Reaper. I've recorded on my Focusrite 2i2 and POD XT Live with no problems, so the headphones are fine. The only time when something like this has occured was when I set the buffer on my 2i2 too low so it was struggling, the X3 sounds like that all the time. I've tried setting the sample rate and headphone volume from the Line 6 control panel and nothing seems to change. From the playback devices tab under sound in control panel when I right click on the properties tab and try to change the default format, which is 16 bit, 44100 Hz to 24 bit, 44100 Hz, it says that the device does not support the format.
Could it be that this is the problem? I mean, I find it hard to believe since I've read that it can function on that specific bitrate and sample rate, and now I can't set it to that, and it crackles in my headphones so much that I can't even use it for monitoring. Is there a solution to this?