diff --git a/media-sound/zynaddsubfx/Manifest b/media-sound/zynaddsubfx/Manifest
new file mode 100644
index 00000000..57b7d092
--- /dev/null
+++ b/media-sound/zynaddsubfx/Manifest
@@ -0,0 +1 @@
+DIST zynaddsubfx-3.0.5.tar.bz2 8141703 BLAKE2B 61f28a62d5ef8c17b5e38febb8ad1ecd40c80f87b26d90804131b97b57534adf5ad96a1f54980b75fd5e71185e2d5376a7df35696c7bcfd593b5d8e34bd2e386 SHA512 1e4d5a6393937e6c7103e6d0e97df76f2d129350854c2f338aa888591091b1508c63e9b52c8e5a176e282ff2f6b72c6a87de54875c412771aff26e8ece2c84e8
diff --git a/media-sound/zynaddsubfx/files/zynaddsubfx-3.0.5-docs.patch b/media-sound/zynaddsubfx/files/zynaddsubfx-3.0.5-docs.patch
new file mode 100644
index 00000000..44060eaf
--- /dev/null
+++ b/media-sound/zynaddsubfx/files/zynaddsubfx-3.0.5-docs.patch
@@ -0,0 +1,12 @@
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -28,9 +28,6 @@ include(CTestConfig.cmake)
+ add_subdirectory(src)
+ add_subdirectory(doc) # Doxygen only
+
+-install(FILES AUTHORS.txt COPYING HISTORY.txt README.adoc
+-	DESTINATION share/doc/zynaddsubfx
+-	)
+ install(FILES zynaddsubfx-jack-multi.desktop zynaddsubfx-jack.desktop zynaddsubfx-alsa.desktop zynaddsubfx-oss.desktop
+     DESTINATION share/applications)
+ install(FILES zynaddsubfx.svg
diff --git a/media-sound/zynaddsubfx/metadata.xml b/media-sound/zynaddsubfx/metadata.xml
new file mode 100644
index 00000000..7d4293bc
--- /dev/null
+++ b/media-sound/zynaddsubfx/metadata.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>marcan@marcan.st</email>
+		<name>Hector Martin</name>
+	</maintainer>
+	<maintainer type="project">
+		<email>proaudio@gentoo.org</email>
+		<name>Gentoo ProAudio Project</name>
+	</maintainer>
+	<use>
+		<flag name="dssi">Enable support for DSSI Soft Synth Interface</flag>
+		<flag name="zest">Enable support for the zyn-fusion zest UI</flag>
+	</use>
+	<upstream>
+		<remote-id type="sourceforge">zynaddsubfx</remote-id>
+	</upstream>
+</pkgmetadata>
diff --git a/media-sound/zynaddsubfx/zynaddsubfx-3.0.5-r1.ebuild b/media-sound/zynaddsubfx/zynaddsubfx-3.0.5-r1.ebuild
new file mode 100644
index 00000000..0a3467c7
--- /dev/null
+++ b/media-sound/zynaddsubfx/zynaddsubfx-3.0.5-r1.ebuild
@@ -0,0 +1,96 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake flag-o-matic
+
+DESCRIPTION="Software synthesizer capable of making a countless number of instruments"
+HOMEPAGE="http://zynaddsubfx.sourceforge.net/"
+SRC_URI="mirror://sourceforge/zynaddsubfx/${P}.tar.bz2"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64"
+IUSE="alsa doc dssi +fltk jack lash portaudio zest"
+
+REQUIRED_USE="|| ( alsa jack portaudio )"
+
+BDEPEND="
+	virtual/pkgconfig
+	doc? ( app-doc/doxygen )
+"
+DEPEND="
+	>=dev-libs/mxml-2.2.1
+	media-libs/liblo
+	sci-libs/fftw:3.0
+	sys-libs/zlib
+	alsa? ( media-libs/alsa-lib )
+	dssi? ( media-libs/dssi )
+	fltk? (
+		>=x11-libs/fltk-1.3:1
+		x11-libs/libX11
+		x11-libs/libXpm
+	)
+	jack? ( virtual/jack )
+	lash? ( media-sound/lash )
+	portaudio? ( media-libs/portaudio )
+"
+RDEPEND="${DEPEND}
+	zest? ( media-sound/zyn-fusion )
+"
+
+PATCHES=( "${FILESDIR}"/${P}-docs.patch )
+
+DOCS=( ChangeLog HISTORY.txt README.adoc )
+
+src_prepare() {
+	cmake_src_prepare
+
+	if ! use dssi; then
+		sed -i -e '/pkg_search_module.*DSSI/s/^/#DONT/' src/CMakeLists.txt || die
+	fi
+	if ! use jack; then
+		sed -e '/pkg_check_modules.*JACK/s/^/#DONT/' -i {rtosc,src}/CMakeLists.txt || die
+	fi
+	if ! use lash; then
+		sed -i -e '/pkg_search_module.*LASH/s/^/#DONT/' src/CMakeLists.txt || die
+	fi
+	if ! use portaudio; then
+		sed -i -e '/pkg_check_modules.*PORTAUDIO/s/^/#DONT/' src/CMakeLists.txt || die
+	fi
+
+	# FIXME upstream: sandbox error
+	sed -i -e '/add_subdirectory(bash-completion)/d' doc/CMakeLists.txt || die
+}
+
+src_configure() {
+	append-cxxflags -std=c++11
+
+	local mycmakeargs=(
+		-DPluginLibDir=$(get_libdir)
+		$(cmake_use_find_package alsa Alsa)
+		$(cmake_use_find_package doc Doxygen)
+		$(cmake_use_find_package fltk FLTK)
+	)
+	if use zest ; then
+		mycmakeargs+=( -DGuiModule=zest )
+	elif use fltk ; then
+		mycmakeargs+=( -DGuiModule=fltk )
+	else
+		mycmakeargs+=( -DGuiModule=off )
+	fi
+	cmake_src_configure
+}
+
+src_compile() {
+	cmake_src_compile
+	use doc && cmake_src_compile doc
+}
+
+src_install() {
+	use doc && local HTML_DOCS=( "${BUILD_DIR}"/doc/html/. )
+	cmake_src_install
+	insinto /usr/share/${PN}
+	doins -r instruments/*
+}