CONFIG_SND_SEQUENCER
  Say 'Y' or 'M' to enable MIDI sequencer and router support. This feature
  allows routing and enqueing MIDI events. Events can be processed at given
  time.

CONFIG_SND_SEQ_DUMMY
  Say 'Y' or 'M' to enable dummy sequencer client. This client is a simple
  midi-through client. All normal input events are redirected to output port
  immediately.

CONFIG_SND_OSSEMUL
  Say 'Y' to enable OSS (Open Sound System) API emulation code.

CONFIG_SND_MIXER_OSS
  Say 'Y' or 'M' to enable mixer OSS API emulation (/dev/mixer*).

CONFIG_SND_PCM_OSS
  Say 'Y' or 'M' to enable digital audio (PCM) OSS API emulation (/dev/dsp*).

CONFIG_SND_SEQUENCER_OSS
  Say 'Y' or 'M' to enable OSS sequencer emulation (both /dev/sequencer and
  /dev/music interfaces).

CONFIG_SND_RTCTIMER
  Say 'Y' or 'M' to enable RTC timer support for ALSA. ALSA code uses RTC
  timer as precise timing source and maps the RTC timer to the ALSA's timer
  interface. ALSA sequencer code can also use this timing source.

CONFIG_SND_VERBOSE_PRINTK
  Say 'Y' to enable verbose log messages. These messages will help to
  identify source file and position containing printed messages.

CONFIG_SND_DEBUG
  Say 'Y' to enable ALSA debug code.

CONFIG_SND_DEBUG_MEMORY
  Say 'Y' to enable debugging of memory allocation.

CONFIG_SND_DEBUG_DETECTION
  Say 'Y' to enable debugging of hardware detection.