From 135ffdcf6b27411b0d075449b0eda8e4c5fdd2cb Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Tue, 4 Jul 2017 20:09:11 +0200
Subject: [PATCH] Work-around for plugins with log-scale parameter 0..SR/2

---
 libs/ardour/parameter_descriptor.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libs/ardour/parameter_descriptor.cc b/libs/ardour/parameter_descriptor.cc
index 9e02bc01ab..3bbc37e95e 100644
--- a/libs/ardour/parameter_descriptor.cc
+++ b/libs/ardour/parameter_descriptor.cc
@@ -157,6 +157,10 @@ ParameterDescriptor::update_steps()
 	if (toggled || enumeration) {
 		logarithmic = false;
 	}
+	if (logarithmic && sr_dependent && upper > lower && lower == 0) {
+		/* work-around for plugins with a log-scale control 0..SR; log (0) is not defined */
+		lower = upper / 1000.f;
+	}
 	if (logarithmic && (upper <= lower || lower * upper <= 0)) {
 		logarithmic = false;
 	}