diff --git a/src/config.h b/src/config.h
index d60ad56..991bb50 100644
--- a/src/config.h
+++ b/src/config.h
@@ -1,5 +1,11 @@
 #pragma once
 
+
+// Sleep this many millis after each loop.
+// Prevents absurd cpu usage.
+#define LOOP_SLEEP_MS 20
+
+
 // USB device params
 #define HID_VENDOR_ID 0x3297
 #define HID_PRODUCT_ID 0x4976
diff --git a/src/ergodox.cpp b/src/ergodox.cpp
index 157d22f..95010fb 100644
--- a/src/ergodox.cpp
+++ b/src/ergodox.cpp
@@ -206,10 +206,9 @@ bool Ergodox::read() {
 		// If keyboard sends a state packet, parse it.
 		case CMD_SEND_STATE:
 			if (animation_mode != read_buf[1]) {
-				spdlog::info("Mode set to {0:x}", read_buf[1]);
+				spdlog::info("Mode set to 0x{0:02x}", read_buf[1]);
 				animation_mode = read_buf[1];
 			}
-
 			// Main code should not parse state packets.
 			return false;
 	}
diff --git a/src/main.cpp b/src/main.cpp
index 9e75cd7..f2aeb5f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -119,7 +119,6 @@ int main(int argc, char *argv[]) {
 					buf.update();
 					fft.update(buf);
 
-					hid_buf[0] = CMD_ANIM_DATA_fft;
 					for (size_t i = 0; i < 10; i++) {
 						// Get height from fft, apply bottom_skip
 						ssize_t h = fft.get_output()[i] - BOTTOM_SKIP;
@@ -129,11 +128,11 @@ int main(int argc, char *argv[]) {
 						h = h>KB_RESOLUTION ? KB_RESOLUTION : h;
 						h = h<0 ? 0 : h;
 
-						hid_buf[i + 1] = h;
+						hid_buf[i] = h;
 					}
+					Dox.write(CMD_ANIM_DATA, hid_buf, Dox.packet_size);
 				}
 
-				Dox.write(CMD_ANIM_DATA, hid_buf, Dox.packet_size);
 
 				t = std::chrono::steady_clock::now();
 			}
@@ -152,9 +151,16 @@ int main(int argc, char *argv[]) {
 						break;
 				}
 			}
+
 		} else {
 			Dox.connect_loop();
 		}
+
+		// Sleep for a bit so we don't consume
+		// 100% of a cpu.
+		std::this_thread::sleep_for(
+			std::chrono::milliseconds(LOOP_SLEEP_MS)
+		);
 	}
 
 	mpd_connection_free(conn);