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-rwxr-xr-xsoxdial2
1 files changed, 2 insertions, 0 deletions
diff --git a/soxdial b/soxdial
index e445d55..7726c8a 100755
--- a/soxdial
+++ b/soxdial
@@ -430,6 +430,8 @@ sub add_bluebox_digit {
# --norm is needed because otherwise, the volume decreases as the number of
# digits (tones for "synth") goes up. --norm=-3 helps avoid clipping.
sub make_sox_subcmd {
+ return ":" unless @freqs1;
+
my $length = shift || $digittime;
my $cmd = "sox -n -b$bits $encoding -r$rate -c1 -traw - --norm=-3 ";
my $synth = " synth $length ";