tweaks

src/main.c

             uint32_t now = to_ms_since_boot(get_absolute_time());
             if ((now - last) >= 250) {
                 state = !state;
+                last = now;
                 led_set(0, state);
             }
         }

src/sequence.c

 void sequence_init(void) {
     us_per_beat = 0;
     beats = MAX_BEATS;
-    last_t = to_ms_since_boot(get_absolute_time());
+    last_t = to_us_since_boot(get_absolute_time());
     last_i = 0;
     max_banks_currently = (beats + (NUM_BTNS - 1)) / NUM_BTNS;
 
             }
         }
 
-        last_t = now;
+        last_t += us;
         last_i = i;
     }
 }