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doc/aubioonset.txt: improve threshold description (thanks to Peter Parker)

--- a/doc/aubioonset.txt

+++ b/doc/aubioonset.txt

@@ -47,10 +47,10 @@

   -O, --onset method  The onset detection method to use. See ONSET METHODS

   below. Defaults to 'default'.

-  -t, --onset-threshold thres  Set the threshold value for the onset peak

-  picking. Typical values are typically within 0.001 and 0.900. Defaults to

-  0.1. Lower threshold values imply more onsets detected. Try 0.5 in case of

-  over-detections. Defaults to 0.3.

+  - t, --onset-threshold thres  Set the threshold value for the onset peak

+  picking. Values are typically in the range [0.001, 0.900]. Lower threshold

+  values imply more onsets detected. Increasing this threshold should reduce

+  the number of incorrect detections. Defaults to 0.3.

   -s, --silence sil  Set the silence threshold, in dB, under which the pitch

   will not be detected. A value of -20.0 would eliminate most onsets but the