FreeBSD стерео: поменять левый с правым

Multichannel Audio Multichannel audio, popularly referred to as «surround sound» is sup- ported and enabled by default. The FreeBSD multichannel matrix proces- sor supports up to 18 interleaved channels, but the limit is currently set to 8 channels (as commonly used for 7.1 surround sound). The in- ternal matrix mapping can handle reduction, expansion or re-routing of channels. This provides a base interface for related multichannel ioctl() support. Multichannel audio works both with and without VCHANs.

Most bridge device drivers are still missing multichannel matrixing support, but in most cases this should be trivial to implement. Use the dev.pcm.%d.[play|rec].vchanformat sysctl(8) to adjust the number of channels used. The current multichannel interleaved structure and arrangement was implemented by inspecting various popular UNIX applica- tions. There were no single standard, so much care has been taken to try to satisfy each possible scenario, despite the fact that each ap- plication has its own conflicting standard.

- очевидно, что без дописывания собственной матрицы и перекомпилирования, нет. Но написано, что это просто и всё необходимое в ядре есть.

Надеялся на тюнинг /boot/device.hints, где можно указать подсказки (хинты) устройствам, в том числе аудио-драйверу hda.