-extern int seq_default_timer_class;
-extern int seq_default_timer_sclass;
-extern int seq_default_timer_card;
-extern int seq_default_timer_device;
-extern int seq_default_timer_subdevice;
-extern int seq_default_timer_resolution;
+/* allowed sequencer timer frequencies, in Hz */
+#define MIN_FREQUENCY 10
+#define MAX_FREQUENCY 6250
+#define DEFAULT_FREQUENCY 1000