Hello,
I just started clean archlinux container to see what's up with the dependencies. Seems like it is more than just aubio missing.
I got to this list before hitting high enough wall:
depends=('ffmpeg' 'avahi' 'pulseaudio' 'python-pyaudio-git' 'python-voluptuous' 'python-rpi-ws281x' 'python-uvloop' 'python-pillow' 'python-zeroconf')
makedepends=('git' 'python-setuptools' 'python-wheel' 'python-pip' 'portaudio' 'ffmpeg')
But then it also looks for python-tcp-latency, which does not exist in AUR. Also the python-voluptuous package is set to voluptuous~=0.12.1 in requires.txt but the version in Arch community repo is already 0.13.1.
I still use ledfx but I think it is simpler to run this one in virtualenv. I will orphan it so you can possibly hunt down all the dependencies and create packages for missing python modules.
Best regards,
Jānis