diff --git a/calculate/utils/package.py b/calculate/utils/package.py
index bb72580..73df82f 100644
--- a/calculate/utils/package.py
+++ b/calculate/utils/package.py
@@ -493,6 +493,15 @@ class PackageAtomParser:
         self._atom_dictionary.clear()
         return atom_name_object
 
+    def is_package_exists(self, package_atom):
+        try:
+            self.parse_package_parameter(package_atom)
+            return True
+        except PackageAtomError as e:
+            if e.errno == NOTEXIST:
+                return False
+            raise
+
     def _check_package_existance(self, package_atom=''):
         '''Метод для проверки существования пакета. Существование пакета
         определяется наличием соответствующего CONTENTS файла.'''
diff --git a/calculate/vars/install/os/__init__.py b/calculate/vars/install/os/__init__.py
index b977023..c2a8fa1 100644
--- a/calculate/vars/install/os/__init__.py
+++ b/calculate/vars/install/os/__init__.py
@@ -1,10 +1,40 @@
-import os
 from calculate.variables.datavars import Variable, Namespace, Dependence, \
-    StringType, BooleanType, HashType, Calculate, Copy
+    StringType, BooleanType, HashType, ListType, Calculate, Copy
 from calculate.vars.main.os.func import get_arch_gentoo
 
+from calculate.utils.package import PackageAtomParser
+
+def get_available_audio_system():
+    audio_systems = (
+        ('alsa', None),
+        ('pulseaudio', 'media-sound/pulseaudio')
+    )
+    package_db = PackageAtomParser()
+    return [
+        audio_system
+        for audio_system, pkg in audio_systems
+        if pkg is None or package_db.is_package_exists(pkg)
+    ]
+
+def get_audio_selected(available_systems, cmdline_audio):
+    available_systems = available_systems.value
+
+    if 'pulseaudio' in available_systems:
+        cmdline_audio = cmdline_audio.value
+        if cmdline_audio and cmdline_audio == 'alsa':
+            return 'alsa'
+        else:
+            return 'pulseaudio'
+    return 'alsa'
+
 with Namespace("arch"):
     Variable("machine", type=StringType,
         source=Copy("main.os.arch.machine"))
     Variable("gentoo", type=StringType,
         source=Calculate(get_arch_gentoo, ".machine"))
+
+with Namespace("audio"):
+    Variable("available", type=ListType,
+        source=Calculate(get_available_audio_system))
+    Variable("selected", type=StringType, 
+        source=Calculate(get_audio_selected, ".available", "main.cl.cmdline.calculate.audio"))
diff --git a/calculate/vars/install/os/func.py b/calculate/vars/install/os/func.py
new file mode 100644
index 0000000..362495e
--- /dev/null
+++ b/calculate/vars/install/os/func.py
@@ -0,0 +1,24 @@
+from calculate.utils.package import PackageAtomParser
+
+def get_available_audio_system():
+    audio_systems = (
+        ('alsa', None),
+        ('pulseaudio', 'media-sound/pulseaudio')
+    )
+    package_db = PackageAtomParser()
+    return [
+        audio_system
+        for audio_system, pkg in audio_systems
+        if pkg is None or package_db.is_package_exists(pkg)
+    ]
+
+def get_audio_selected(available_systems, cmdline_audio):
+    available_systems = available_systems.value
+
+    if 'pulseaudio' in available_systems:
+        cmdline_audio = cmdline_audio.value
+        if cmdline_audio and cmdline_audio == 'alsa':
+            return 'alsa'
+        else:
+            return 'pulseaudio'
+    return 'alsa'
diff --git a/tests/vars/test_vars.py b/tests/vars/test_vars.py
index 46e87e8..40b9043 100644
--- a/tests/vars/test_vars.py
+++ b/tests/vars/test_vars.py
@@ -1,7 +1,7 @@
 import pytest
-import calculate.vars.main.os.x11 as main_os_x11
-import calculate.vars.main.cl as main_cl
 import calculate.vars.main.os as main_os
+import calculate.vars.main.cl as main_cl
+import calculate.vars.main.os.x11 as main_os_x11
 from calculate.vars.main.cl import CmdlineParams
 import mock
 from itertools import chain
@@ -13,8 +13,7 @@ from itertools import chain
             "failed": True,
             "data": "",
             "result": ""
-        },
-        {
+        }, {
             "name": "worked xdpyinfo",
             "failed": False,
             "data": open('tests/vars/xdpyinfo.output','r').read(),
@@ -115,3 +114,48 @@ def test_main_os_get_arch_gentoo(case):
         def __init__(self, value):
             self.value = value
     assert main_os.get_arch_gentoo(Var(case["source"])) == case["result"]
+
+
+import calculate.vars.install.os.func as install_os
+@pytest.mark.parametrize('case',
+    [
+        {
+            "name": "pulseaudio exists",
+            "exists": True,
+            "result": ["alsa","pulseaudio"]
+        },
+        {
+            "name": "pulseaudio not exists",
+            "exists": False,
+            "result": ["alsa"]
+        },
+    ],
+    ids=lambda x:x["name"])
+@pytest.mark.calculate_vars
+def test_install_os_get_available_audio_system(case):
+    with mock.patch('calculate.vars.install.os.func.PackageAtomParser.is_package_exists') as exists:
+        exists.return_value = case["exists"]
+    assert install_os.get_available_audio_system() == case["result"]
+
+#def get_available_audio_system():
+#    audio_systems = (
+#        ('alsa', None),
+#        ('pulseaudio', 'media-sound/pulseaudio')
+#    )
+#    package_db = PackageAtomParser()
+#    return [
+#        audio_system
+#        for audio_system, pkg in audio_systems
+#        if pkg is None or package_db.is_package_exists(pkg)
+#    ]
+#
+#def get_audio_selected(available_systems, cmdline_audio):
+#    available_systems = available_systems.value
+#
+#    if 'pulseaudio' in available_systems:
+#        cmdline_audio = cmdline_audio.value
+#        if cmdline_audio and cmdline_audio == 'alsa':
+#            return 'alsa'
+#        else:
+#            return 'pulseaudio'
+#    return 'alsa'