Are there screws to secure the cable to the headphones? Accidental yanks at either end of the cable could mean a fried amp for me...

You will short the batteries if you wire it like that. You need a rail splitter after the switch to create a ground if you want to switch between battery and wall-power.   Information on virtual ground: http://tangentsoft.net/elec/vgrounds.html In your case, it can be as simple as adding a...

Minimum voltage for the JRC 4560D opamp is ±4V, which means you'll quickly run into battery life issues. You can't use one battery without modifying the circuit because of the way the Banzai CMOY splits the voltage rails.

Is the twist above or below the split? If above, try taking the wire the knot and wrap it above the headphones to the other side, etc. My D5000 came with a seemingly permanent twist on the left side above the split until I played around with it. It's hard to explain since I don't remember how I...

The α20 can be run in unity gain, perfect for IEMs.

If the OLED is similar to the ones used in the Sansa clip, the background will be pitch black. All you'll see in the dark is the colored text, hopefully no light bleeding. Should be a joy to use, but the firmware will need to be updated to include code to blank out the screen.

Looks good. The OLED displays has some unused pins (contrast, backlight), and uses about 10mA more current. I might try one out...

I see some potential bridging with the solder strings on the WM8524 and some pins that look unsoldered on the PCM2706.   If you're getting 5V on VBUS and 3.3V on the 3V3 checkpoint, then everything is fine voltage wise. Check the crystal as well.   Your WM8524 does look like it has pins...

Is there an option for middle click?

See if the spectrum gets any snappier with ASIO4ALL. Love the responsiveness of it with any song.

If there is a kink that won't straighten out, try wrapping that side of the cable around the headphone. If you double kink it, wrap it the other way. It's a bit hard to explain, but there's only one way to fix it without cutting up the cable.

You can hard reset it if you hold down the power button for a while. It works on the regular Clip, but I haven't had the Clip+ freeze on me yet.

y2 powering active speakers are fine, but I recommend a preamp in the path because it may be hard to control volume due to the speaker amp's high gain. If using any low impedance phones, just change the output capacitors to 470uF, both y2 and y1.   Just note that Windows cannot control the...

I started around two years ago, so age 19, second year in college. Still a lot of stuff to try out, but have to finish up college before I can really tinker around with something other than headphones. Wish I started earlier.

Do you know what DAC chip your DAC uses? The Fubar II mentioned uses the PCM2702, and from the pictures I see of the Cantate it also uses the PCM2702. I do not have any problems with my PCM2702 based BantamDAC.