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-rw-r--r--src/mame/drivers/thunderj.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/drivers/thunderj.cpp b/src/mame/drivers/thunderj.cpp
index e82d772a168..6ad4469637b 100644
--- a/src/mame/drivers/thunderj.cpp
+++ b/src/mame/drivers/thunderj.cpp
@@ -282,7 +282,7 @@ void thunderj_state::thunderj(machine_config &config)
ATARI_JSA_II(config, m_jsa, 0);
m_jsa->main_int_cb().set_inputline(m_maincpu, M68K_IRQ_6);
m_jsa->test_read_cb().set_ioport("260012").bit(1);
- m_jsa->add_route(ALL_OUTPUTS, "mono", 1.0);
+ m_jsa->add_route(ALL_OUTPUTS, "mono", 0.8);
}