+
+static inline double
+gain_to_slider_position (ARDOUR::gain_t g)
+{
+ if (g == 0) return 0;
+ return pow((6.0*log(g)/log(2.0)+192.0)/198.0, 8.0);
+
+}
+
+static inline ARDOUR::gain_t
+slider_position_to_gain (double pos)
+{
+ /* XXX Marcus writes: this doesn't seem right to me. but i don't have a better answer ... */
+ if (pos == 0.0) return 0;
+ return pow (2.0,(sqrt(sqrt(sqrt(pos)))*198.0-192.0)/6.0);
+}
+
+/* I don't really like hard-coding these falloff rates here
+ * Probably should use a map of some kind that could be configured
+ * These rates are db/sec.
+*/
+
+#define METER_FALLOFF_OFF 0.0f
+#define METER_FALLOFF_SLOWEST 6.6f // BBC standard
+#define METER_FALLOFF_SLOW 8.6f // BBC standard
+#define METER_FALLOFF_MEDIUM 20.0f
+#define METER_FALLOFF_FAST 32.0f
+#define METER_FALLOFF_FASTER 46.0f
+#define METER_FALLOFF_FASTEST 70.0f
+