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-rw-r--r--src/mame/audio/s11c_bg.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/mame/audio/s11c_bg.h b/src/mame/audio/s11c_bg.h
index cab8d03defd..756b71c89f7 100644
--- a/src/mame/audio/s11c_bg.h
+++ b/src/mame/audio/s11c_bg.h
@@ -13,7 +13,9 @@
#include "cpu/m6809/m6809.h"
#include "machine/6821pia.h"
+#include "machine/rescap.h"
#include "sound/dac.h"
+#include "sound/flt_biquad.h"
#include "sound/hc55516.h"
#include "sound/ym2151.h"
@@ -63,6 +65,8 @@ protected:
required_device<mc1408_device> m_dac;
optional_device<ym2151_device> m_ym2151;
optional_device<hc55516_device> m_cvsd;
+ optional_device<filter_biquad_device> m_cvsd_filter;
+ optional_device<filter_biquad_device> m_cvsd_filter2;
required_device<pia6821_device> m_pia40;
required_memory_bank m_cpubank;