N_PLAY_SLOT_CTRL_BANK
channels * N_PLAY_SLOT_CTRL_BANK,
(*sc->ptbl)*N_PLAY_SLOT_CTRL_BANK,
memsize = N_PLAY_SLOTS*N_PLAY_SLOT_CTRL_BANK*pcs +
N_PLAY_SLOT_CTRL_BANK,
struct play_slot_ctrl_bank *pbankp[N_PLAY_SLOT_CTRL_BANK