diff --git a/alsa.c b/alsa.c
index b03ce3a..75a90d0 100644
--- a/alsa.c
+++ b/alsa.c
@@ -126,14 +126,4 @@ alsa_write(uint8_t *data, size_t datalen)
 	}	
 	
 	snd_seq_drain_output(snd_handle);
-
-	{	
-	int i;
-	
-	printf("A> ");
-	for (i = 0; i < datalen; i += 1) {
-		printf("%02x ", data[i]);
-	}
-	printf("\n");
-	}
 }
\ No newline at end of file
diff --git a/usb.c b/usb.c
index 98a5d8f..a629789 100644
--- a/usb.c
+++ b/usb.c
@@ -9,7 +9,7 @@
 #include "dump.h"
 
 static struct libusb_device_handle *usb_dev;
-static struct libusb_transfer *xfer;
+static struct libusb_transfer *xfer = NULL;
 static const struct device *d;
 uint8_t data[80];
 
@@ -31,6 +31,9 @@ static void
 usb_initiate_transfer()
 {
 	// Tell libusb we want to know about bulk transfers
+	if (xfer) {
+		libusb_free_transfer(xfer);
+	}
 	xfer = libusb_alloc_transfer(0);
 	libusb_fill_bulk_transfer(xfer, usb_dev, d->ep_in, data, sizeof(data), usb_xfer_done, NULL, 0);
 	libusb_submit_transfer(xfer);
@@ -43,7 +46,6 @@ usb_xfer_done(struct libusb_transfer *transfer)
 	int datalen = transfer->actual_length;
 
 	alsa_write(data, datalen);
-	
 	usb_initiate_transfer();
 }
 
@@ -133,14 +135,19 @@ usb_check_fds(fd_set *rfds, fd_set *wfds)
 	}
 }
 
+
+void
+usb_write_done(struct libusb_transfer *transfer)
+{
+	libusb_free_transfer(transfer);
+}
+
 void
 usb_write(uint8_t *data, size_t datalen)
 {
-	int i;
+	struct libusb_transfer *xfer;
 	
-	printf("U> ");
-	for (i = 0; i < datalen; i += 1) {
-		printf("%02x ", data[i]);
-	}
-	printf("\n");
+	xfer = libusb_alloc_transfer(0);
+	libusb_fill_bulk_transfer(xfer, usb_dev, d->ep_out, data, datalen, usb_write_done, NULL, 0);
+	libusb_submit_transfer(xfer);
 }
\ No newline at end of file