diff --git a/src/ansible_preset_docdef.c b/src/ansible_preset_docdef.c
@@ -153,6 +153,25 @@ json_docdef_t ansible_shared_docdefs[] = {
 			})
 		})
 	},
+	{
+		.name = "tuning_table",
+		.read = json_read_array,
+		.write = json_write_array,
+		.state = &ansible_json_read_array_state,
+		.params = &((json_read_array_params_t) {
+			.array_len = sizeof_field(nvram_data_t, tuning_table) / sizeof_field(nvram_data_t, tuning_table[0]),
+			.item_size = sizeof_field(nvram_data_t, tuning_table[0]),
+			.item_docdef = &((json_docdef_t) {
+				.read = json_read_buffer,
+				.write = json_write_buffer,
+				.state = &ansible_json_read_buffer_state,
+				.params = &((json_read_buffer_params_t) {
+					.dst_size = sizeof_field(nvram_data_t, tuning_table[0]),
+					.dst_offset = offsetof(nvram_data_t, tuning_table),
+				}),
+			})
+		})
+	},
 };
 
 /////////

diff --git a/src/main.c b/src/main.c
@@ -46,6 +46,7 @@ usb flash
 #include "init_common.h"
 #include "monome.h"
 #include "midi.h"
+#include "music.h"
 #include "notes.h"
 #include "timers.h"
 #include "util.h"
@@ -120,6 +121,8 @@ softTimer_t auxTimer[4] = {
 	{ .next = NULL, .prev = NULL }
 };
 
+uint16_t tuning_table[4][120];
+
 static uint8_t clock_phase;
 
 void handler_None(s32 data) { ;; }
@@ -445,6 +448,37 @@ void flash_read(void) {
 	// ...
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// tuning
+
+void default_tuning(void) {
+	for (uint8_t i = 0; i < 4; i++) {
+		flashc_memcpy((void *)&f.tuning_table[i], ET, sizeof(ET), true);
+	}
+}
+
+void init_tuning(void) {
+	for (uint8_t i = 0; i < 4; i++) {
+		memcpy((void*)&tuning_table[i], &f.tuning_table[i], 120);
+	}
+	/* memcpy((void *)&tuning_table, &f.tuning_table, sizeof(tuning_table)); */
+}
+
+void fit_tuning(void) {
+	for (uint8_t i = 0; i < 4; i++) {
+		float step = 0.0;
+		for (uint8_t j = 0; j < 10; j++) {
+			float acc = tuning_table[i][j*12];
+			if (j < 9) {
+				step = (tuning_table[i][(j+1)*12] - tuning_table[i][j*12]) / 12.0;
+			}
+			for (uint8_t k = j*12; k < (j+1)*12; k++) {
+				tuning_table[i][k] = acc;
+				acc += step;
+			}
+		}
+	}
+}
 
 ////////////////////////////////////////////////////////////////////////////////
 // functions
@@ -489,6 +523,7 @@ void clock_set_tr(uint32_t n, uint8_t phase) {
 ///////
 // global ii handlers
 void load_flash_state(void) {
+	init_tuning();
 	init_levels();
 	init_cycles();
 	init_kria();
@@ -587,6 +622,7 @@ int main(void)
 		flashc_memset32((void*)&(f.state.midi_mode), mMidiStandard, 4, true);
 		flashc_memset8((void*)&(f.state.i2c_addr), 0xA0, 1, true);
 		flashc_memset8((void*)&(f.state.grid_varibrightness), 16, 1, true);
+		default_tuning();
 		default_kria();
 		default_mp();
 		default_es();

diff --git a/src/main.h b/src/main.h
@@ -60,15 +60,20 @@ typedef const struct {
 	midi_arp_state_t midi_arp_state;
 	tt_state_t tt_state;
 	uint8_t scale[16][8];
+	uint8_t tuning_table[4][120];
 } nvram_data_t;
 
 extern nvram_data_t f;
 extern ansible_mode_t ansible_mode;
 
 extern softTimer_t auxTimer[4];
+extern uint16_t tuning_table[4][120];
 
 
 void (*clock)(u8 phase);
+void init_tuning(void);
+void default_tuning(void);
+void fit_tuning(void);
 
 extern void handler_None(s32 data);
 extern void clock_null(u8 phase);