diff --git a/audio/zynaddsubfx/Makefile b/audio/zynaddsubfx/Makefile
index 8c630cb85ea0..aeff435a0ada 100644
--- a/audio/zynaddsubfx/Makefile
+++ b/audio/zynaddsubfx/Makefile
@@ -1,116 +1,115 @@
 # Created by: trasz <trasz@pin.if.uz.zgora.pl>
 
 PORTNAME=	zynaddsubfx
-DISTVERSION=	3.0.6-rc3
+DISTVERSION=	3.0.6-rc4
 PORTEPOCH=	1
-PORTREVISION=	4
 CATEGORIES=	audio
 
 MAINTAINER=	hselasky@FreeBSD.org
 COMMENT=	Realtime software synthesizer
 
 LICENSE=	GPLv2
 
 LIB_DEPENDS=	libfftw3.so:math/fftw3 \
 		libmxml.so:textproc/mxml \
 		liblo.so:audio/liblo
 
 USES=		cmake:insource compiler:c++11-lang pkgconfig tar:bzip2
 USE_LDCONFIG=	yes
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	zynaddsubfx
 GH_TUPLE=	DISTRHO:DPF:e0d8e14a14d407648768da7e34bcf31812245387:d/DPF \
-		fundamental:rtosc:7de244bae04deb5964516ba544e551d95e7f15ce:e/rtosc \
+		fundamental:rtosc:a86bb27bd16d796b10104f264e8ea96130c1d61c:e/rtosc \
 		zynaddsubfx:instruments:39e17e1c5c3db56fe9d0308af28be90f172e455e:f/instruments
 
 OPTIONS_DEFINE=		BASH OSS JACK GUI PORTAUDIO SNDIO LASH DOCS EXAMPLES
 OPTIONS_DEFAULT=	OSS JACK GUI PORTAUDIO
 OPTIONS_RADIO=		AUDIO
 OPTIONS_RADIO_AUDIO=	ALSAMIDI DSSI
 OPTIONS_SUB=		yes
 
 ALSAMIDI_DESC=	MIDI input through ALSA
 DSSI_DESC=	DSSI Plugin
 
 ALSAMIDI_LIB_DEPENDS=		libasound.so:audio/alsa-lib
 ALSAMIDI_CMAKE_OFF=		-DAlsaEnable:BOOL=OFF
 
 BASH_DESC=			Support for bash auto-completion
 BASH_BUILD_DEPENDS=		bash-completion>=0:shells/bash-completion
 
 DSSI_LIB_DEPENDS=		libdssialsacompat.so:audio/libdssialsacompat
 DSSI_BUILD_DEPENDS=		dssi>0:audio/dssi
 DSSI_RUN_DEPENDS=		dssi>0:audio/dssi
 DSSI_CFLAGS=			-I${LOCALBASE}/include/dssi
 DSSI_CMAKE_OFF=			-DDssiEnable:BOOL=OFF
 
 GUI_LIB_DEPENDS=		libntk.so:x11-toolkits/ntk \
 				libpng.so:graphics/png \
 				libfontconfig.so:x11-fonts/fontconfig
 GUI_CMAKE_ON=			-DGuiModule:STRING=ntk
 GUI_CMAKE_OFF=			-DGuiModule:STRING=OFF
 GUI_USE+=			XORG=x11,xext,xfixes,xcursor,xrender,ice,sm,xpm,xinerama,xft
 GUI_USE+=			GL=gl,glu
 GUI_USES=			gl gnome jpeg xorg
 
 OSS_CMAKE_ON=			-DOssEnable:BOOL=ON
 OSS_CMAKE_OFF=			-DOssEnable:BOOL=OFF
 
 LASH_LIB_DEPENDS=		liblash.so:audio/lash
 LASH_CMAKE_OFF=			-DLashEnable:BOOL=OFF
 
 JACK_LIB_DEPENDS=		libjack.so:audio/jack
 JACK_CMAKE_OFF=			-DJackEnable:BOOL=OFF
 
 PORTAUDIO_LIB_DEPENDS=		libportaudio.so:audio/portaudio
 PORTAUDIO_CMAKE_OFF=		-DPaEnable:BOOL=OFF
 
 SNDIO_LIB_DEPENDS=		libsndio.so:audio/sndio
 SNDIO_CMAKE_OFF=		-DSndioEnable:BOOL=OFF
 
 PORTDOCS=	*
 
 DOCSRCDIR1=	${WRKSRC}
 DOC_FILES1=	AUTHORS.txt NEWS.txt
 
 DOCSRCDIR2=	${WRKSRC}/doc
 DOCSDIR2=	${DOCSDIR}/doc
 DOC_FILES2=	adsynth.txt controller.txt envelope.txt filter.txt intro.txt \
 		lfo.txt mididefaults.txt nrpn.txt saving.txt zynaddsubfx.txt
 
 DOCSRCDIR3=	${WRKSRC}/doc/images
 DOCSDIR3=	${DOCSDIR}/doc/images
 DOC_FILES3=	*.png *.jpg
 
 PORTEXAMPLES=	*
 
 CMAKE_ARGS+=	-DZYN_DATADIR:STRING=${DATADIR}
 CMAKE_ARGS+=	-DZYN_EXAMPLESDIR:STRING=${EXAMPLESDIR}
 
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == "i386" || ${ARCH} == "amd64"
 CFLAGS+=	-DASM_F2I_YES
 .endif
 
 post-patch:
 	@${REINPLACE_CMD} -e \
 		's|-O3 .* -fomit-frame-pointer|| ; \
 		 /-DASM_F2I_YES/d ; \
 		 /-g #/d' ${WRKSRC}/src/CMakeLists.txt
 
 post-install:
 	@${MKDIR} ${STAGEDIR}${DATADIR}/banks \
 		${STAGEDIR}${DOCSDIR} \
 		${STAGEDIR}${DOCSDIR2} \
 		${STAGEDIR}${DOCSDIR3} \
 		${STAGEDIR}${EXAMPLESDIR}
 
 	(cd ${WRKSRC}/instruments/banks && \
 		${COPYTREE_SHARE} . ${STAGEDIR}${DATADIR}/banks)
 	${INSTALL_DATA} ${DOC_FILES1:S|^|${DOCSRCDIR1}/|} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${DOC_FILES2:S|^|${DOCSRCDIR2}/|} ${STAGEDIR}${DOCSDIR2}
 	${INSTALL_DATA} ${DOC_FILES3:S|^|${DOCSRCDIR3}/|} ${STAGEDIR}${DOCSDIR3}
 
 .include <bsd.port.post.mk>
diff --git a/audio/zynaddsubfx/distinfo b/audio/zynaddsubfx/distinfo
index 67af1719207d..c8387052ac2a 100644
--- a/audio/zynaddsubfx/distinfo
+++ b/audio/zynaddsubfx/distinfo
@@ -1,9 +1,9 @@
-TIMESTAMP = 1617869603
-SHA256 (zynaddsubfx-zynaddsubfx-3.0.6-rc3_GH0.tar.gz) = 7be1ee7ae4ebb98fb88e9615fedb807a1b3752261afc0ba10f3a5ca963673eed
-SIZE (zynaddsubfx-zynaddsubfx-3.0.6-rc3_GH0.tar.gz) = 3020508
+TIMESTAMP = 1628174433
+SHA256 (zynaddsubfx-zynaddsubfx-3.0.6-rc4_GH0.tar.gz) = ebb5a77bc597ace83d92d5a12cb92090038cd8ee289a3e59deedf45ae9f36ca7
+SIZE (zynaddsubfx-zynaddsubfx-3.0.6-rc4_GH0.tar.gz) = 3025476
 SHA256 (DISTRHO-DPF-e0d8e14a14d407648768da7e34bcf31812245387_GH0.tar.gz) = 8ca3a33825d08066867e661b562e6548844c21967ef97805cde77d03171614c0
 SIZE (DISTRHO-DPF-e0d8e14a14d407648768da7e34bcf31812245387_GH0.tar.gz) = 1596130
-SHA256 (fundamental-rtosc-7de244bae04deb5964516ba544e551d95e7f15ce_GH0.tar.gz) = eb48173874c1e59e3a67c49d239487706e07d24b9cf7eadbabd921c720e709d2
-SIZE (fundamental-rtosc-7de244bae04deb5964516ba544e551d95e7f15ce_GH0.tar.gz) = 181942
+SHA256 (fundamental-rtosc-a86bb27bd16d796b10104f264e8ea96130c1d61c_GH0.tar.gz) = 9e350f310abb654df35d53eb3ae4fc3ecade55deae12f59c2a41b0cb3ee4e9bf
+SIZE (fundamental-rtosc-a86bb27bd16d796b10104f264e8ea96130c1d61c_GH0.tar.gz) = 182038
 SHA256 (zynaddsubfx-instruments-39e17e1c5c3db56fe9d0308af28be90f172e455e_GH0.tar.gz) = 8184f92e7fbd139f3e1ba257948ca2270e58e7bc2b6ccff41f1ffe8922044a81
 SIZE (zynaddsubfx-instruments-39e17e1c5c3db56fe9d0308af28be90f172e455e_GH0.tar.gz) = 5041225