diff --git a/machines-process.cabal b/machines-process.cabal
--- a/machines-process.cabal
+++ b/machines-process.cabal
@@ -1,5 +1,5 @@
 name:                machines-process
-version:             0.2.0.10
+version:             7.0.0.2
 synopsis:            Process (system) utilities for the machines library
 homepage:            http://github.com/aloiscochard/machines-process
 license:             Apache-2.0
@@ -20,5 +20,5 @@
       base                >= 4.6      && < 5
     , chunked-data        >= 0.1      && < 0.4
     , machines            >= 0.2      && < 0.8
-    , machines-io         >= 0.2      && < 0.3
+    , machines-io         >= 0.2      && < 7.1
     , process             >= 1.1      && < 1.7
diff --git a/src/System/Process/Machine.hs b/src/System/Process/Machine.hs
--- a/src/System/Process/Machine.hs
+++ b/src/System/Process/Machine.hs
@@ -9,6 +9,7 @@
 
 type ProcessMachines a b k = (Maybe (ProcessT IO a b), Maybe (MachineT IO k a), Maybe (MachineT IO k a))
 
+
 mStdIn :: IOSource a -> ProcessMachines a a0 k0 -> IO ()
 mStdIn ms (Just stdIn, _, _)  = runT_ $ stdIn <~ ms
 mStdIn _  _                   = return ()
@@ -16,6 +17,13 @@
 mStdOut :: ProcessT IO a b -> ProcessMachines a a0 k0 -> IO [b]
 mStdOut mp (_, Just stdOut, _)  = runT $ mp <~ stdOut
 mStdOut _  _                    = return []
+
+mStdOutputs :: ProcessT IO (Either a a) b -> ProcessMachines a a0 (Is a0) -> IO [b]
+mStdOutputs mp (_, Just stdOut, Just stdErr)  = runT $ mp <~ wye stdErr stdOut slurp where
+  slurp = repeatedly $ do
+    res <- awaits Z
+    yield res
+mStdOutputs _  _                              = return []
 
 {--
 mStdOut_ :: ProcessT IO a b -> ProcessMachines a a0 k0 -> IO ()