diff --git a/libc/kernel/uapi/sound/firewire.h b/libc/kernel/uapi/sound/firewire.h
index 67c010b..198a8f4 100644
--- a/libc/kernel/uapi/sound/firewire.h
+++ b/libc/kernel/uapi/sound/firewire.h
@@ -26,6 +26,7 @@
 #define SNDRV_FIREWIRE_EVENT_DIGI00X_MESSAGE 0x746e736c
 #define SNDRV_FIREWIRE_EVENT_MOTU_NOTIFICATION 0x64776479
 #define SNDRV_FIREWIRE_EVENT_TASCAM_CONTROL 0x7473636d
+#define SNDRV_FIREWIRE_EVENT_MOTU_REGISTER_DSP_CHANGE 0x4d545244
 struct snd_firewire_event_common {
   unsigned int type;
 };
@@ -68,6 +69,11 @@
   unsigned int type;
   struct snd_firewire_tascam_change changes[0];
 };
+struct snd_firewire_event_motu_register_dsp_change {
+  unsigned int type;
+  __u32 count;
+  __u32 changes[];
+};
 union snd_firewire_event {
   struct snd_firewire_event_common common;
   struct snd_firewire_event_lock_status lock_status;
@@ -76,11 +82,15 @@
   struct snd_firewire_event_digi00x_message digi00x_message;
   struct snd_firewire_event_tascam_control tascam_control;
   struct snd_firewire_event_motu_notification motu_notification;
+  struct snd_firewire_event_motu_register_dsp_change motu_register_dsp_change;
 };
 #define SNDRV_FIREWIRE_IOCTL_GET_INFO _IOR('H', 0xf8, struct snd_firewire_get_info)
 #define SNDRV_FIREWIRE_IOCTL_LOCK _IO('H', 0xf9)
 #define SNDRV_FIREWIRE_IOCTL_UNLOCK _IO('H', 0xfa)
 #define SNDRV_FIREWIRE_IOCTL_TASCAM_STATE _IOR('H', 0xfb, struct snd_firewire_tascam_state)
+#define SNDRV_FIREWIRE_IOCTL_MOTU_REGISTER_DSP_METER _IOR('H', 0xfc, struct snd_firewire_motu_register_dsp_meter)
+#define SNDRV_FIREWIRE_IOCTL_MOTU_COMMAND_DSP_METER _IOR('H', 0xfd, struct snd_firewire_motu_command_dsp_meter)
+#define SNDRV_FIREWIRE_IOCTL_MOTU_REGISTER_DSP_PARAMETER _IOR('H', 0xfe, struct snd_firewire_motu_register_dsp_parameter)
 #define SNDRV_FIREWIRE_TYPE_DICE 1
 #define SNDRV_FIREWIRE_TYPE_FIREWORKS 2
 #define SNDRV_FIREWIRE_TYPE_BEBOB 3
@@ -99,4 +109,49 @@
 struct snd_firewire_tascam_state {
   __be32 data[SNDRV_FIREWIRE_TASCAM_STATE_COUNT];
 };
+#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_INPUT_COUNT 24
+#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_OUTPUT_COUNT 24
+#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_COUNT (SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_INPUT_COUNT + SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_OUTPUT_COUNT)
+struct snd_firewire_motu_register_dsp_meter {
+  __u8 data[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_METER_COUNT];
+};
+#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT 4
+#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT 20
+#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_INPUT_COUNT 10
+#define SNDRV_FIREWIRE_MOTU_REGISTER_DSP_ALIGNED_INPUT_COUNT (SNDRV_FIREWIRE_MOTU_REGISTER_DSP_INPUT_COUNT + 2)
+struct snd_firewire_motu_register_dsp_parameter {
+  struct {
+    struct {
+      __u8 gain[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT];
+      __u8 pan[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT];
+      __u8 flag[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT];
+      __u8 paired_balance[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT];
+      __u8 paired_width[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_SRC_COUNT];
+    } source[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT];
+    struct {
+      __u8 paired_volume[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT];
+      __u8 paired_flag[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_MIXER_COUNT];
+    } output;
+  } mixer;
+  struct {
+    __u8 main_paired_volume;
+    __u8 hp_paired_volume;
+    __u8 hp_paired_assignment;
+    __u8 reserved[5];
+  } output;
+  struct {
+    __u8 boost_flag;
+    __u8 nominal_level_flag;
+    __u8 reserved[6];
+  } line_input;
+  struct {
+    __u8 gain_and_invert[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_ALIGNED_INPUT_COUNT];
+    __u8 flag[SNDRV_FIREWIRE_MOTU_REGISTER_DSP_ALIGNED_INPUT_COUNT];
+  } input;
+  __u8 reserved[64];
+};
+#define SNDRV_FIREWIRE_MOTU_COMMAND_DSP_METER_COUNT 400
+struct snd_firewire_motu_command_dsp_meter {
+  float data[SNDRV_FIREWIRE_MOTU_COMMAND_DSP_METER_COUNT];
+};
 #endif