snd_es1968_alloc_apu_pair
apu1 = snd_es1968_alloc_apu_pair(chip, ESM_APU_PCM_PLAY);
apu1 = snd_es1968_alloc_apu_pair(chip, ESM_APU_PCM_CAPTURE);
apu2 = snd_es1968_alloc_apu_pair(chip, ESM_APU_PCM_RATECONV);
apu = snd_es1968_alloc_apu_pair(chip, ESM_APU_PCM_PLAY);