From bb4576b700af86ce2ea43cdfa6af46834befdb87 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Fri, 17 Apr 2015 17:08:52 +0200
Subject: [PATCH] Dummy: fix sine/square frequency sweep

---
 libs/backends/dummy/dummy_audiobackend.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libs/backends/dummy/dummy_audiobackend.cc b/libs/backends/dummy/dummy_audiobackend.cc
index 1428dc28a2..050e99435c 100644
--- a/libs/backends/dummy/dummy_audiobackend.cc
+++ b/libs/backends/dummy/dummy_audiobackend.cc
@@ -1621,7 +1621,7 @@ void DummyAudioPort::setup_generator (GeneratorType const g, float const sampler
 #else
 					const double phase = a * exp (b * j) - a;
 #endif
-					_wavetable[i] = (float)sin (2. * M_PI * (phase - floor (phase)));
+					_wavetable[i] = -(float)sin (2. * M_PI * (phase - floor (phase)));
 				}
 				if (_gen_type == SquareSweep) {
 					for (uint32_t i = 0 ; i < _gen_period; ++i) {