diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright (c) 2015, Ivan Perez
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Ivan Perez nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/Setup.hs b/Setup.hs
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+++ b/Setup.hs
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+import Distribution.Simple
+main = defaultMain
diff --git a/keera-hails-reactive-yampa.cabal b/keera-hails-reactive-yampa.cabal
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--- /dev/null
+++ b/keera-hails-reactive-yampa.cabal
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+-- hails.cabal auto-generated by cabal init. For additional options,
+-- see
+-- http://www.haskell.org/cabal/release/cabal-latest/doc/users-guide/authors.html#pkg-descr.
+-- The name of the package.
+Name:                keera-hails-reactive-yampa
+
+-- The package version. See the Haskell package versioning policy
+-- (http://www.haskell.org/haskellwiki/Package_versioning_policy) for
+-- standards guiding when and how versions should be incremented.
+Version:             0.0.3.3
+
+-- A short (one-line) description of the package.
+Synopsis:            Haskell on Rails - FRP Yampa Signal Functions as RVs
+
+-- A longer description of the package.
+Description:         Yampa-driven Functional Reactive Signal Functions,
+                     as reactive values.
+
+-- URL for the project homepage or repository.
+Homepage:            http://www.keera.es/blog/community/
+
+-- The license under which the package is released.
+License:             BSD3
+
+-- The file containing the license text.
+License-file:        LICENSE
+
+-- The package author(s).
+Author:              Ivan Perez
+
+-- An email address to which users can send suggestions, bug reports,
+-- and patches.
+Maintainer:          ivan.perez@keera.co.uk
+
+-- A copyright notice.
+-- Copyright:           
+
+Category:            Development
+
+Build-type:          Simple
+
+-- Extra files to be distributed with the package, such as examples or
+-- a README.
+-- Extra-source-files:  
+
+-- Constraint on the version of Cabal needed to build this package.
+Cabal-version:       >=1.2
+
+Library
+  hs-source-dirs: src/
+  
+  ghc-options: -Wall -fno-warn-unused-do-bind -O2
+
+  -- Modules exported by the library.
+  Exposed-modules: Hails.Yampa
+  
+  -- Packages needed in order to build this package.
+  Build-depends: base >= 4 && < 5
+               , keera-hails-reactivevalues
+               , keera-callbacks
+               , time
+               , Yampa
diff --git a/src/Hails/Yampa.hs b/src/Hails/Yampa.hs
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--- /dev/null
+++ b/src/Hails/Yampa.hs
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+-- {-# LANGUAGE UndecidableInstances #-}
+-- {-# LANGUAGE FlexibleInstances    #-}
+module Hails.Yampa where
+
+import Control.Monad (when, void)
+import Data.CBMVar
+import Data.IORef
+import Data.Maybe (fromJust)
+import Data.ReactiveValue
+import Data.Time.Clock
+import FRP.Yampa
+
+-- | Define a couple of RVs connected by an SF, so that
+-- writing to one makes the SF process the value and make
+-- the result available in a readable RV.
+yampaReactiveDual :: a -> SF a b
+                  -> IO (ReactiveFieldWrite IO a, ReactiveFieldRead IO b)
+yampaReactiveDual initial sf = do 
+  mvar <- newCBMVar Nothing
+
+  -- Initial clock
+  initialClock <- getCurrentTime
+  lastTimeR    <- newIORef initialClock
+
+  -- Reactimation Handle
+  rh <- reactInit
+          -- Initial value
+          (return initial)
+          -- Actuation
+          (\_ changed output -> do when changed $ writeCBMVar mvar (Just output)
+                                   return False
+          )
+          -- Processing
+          sf
+
+  -- RV fields
+  let getter   = fmap fromJust $ readCBMVar mvar
+      setter y = void $ do -- Calculate time delta
+                           newTime  <- getCurrentTime
+                           lastTime <- readIORef lastTimeR
+                           let dt = realToFrac $ diffUTCTime newTime lastTime
+                           writeIORef lastTimeR newTime
+
+                           -- Run FRP system
+                           react rh (dt, Just y)
+
+      notifier evH = installCallbackCBMVar mvar evH
+
+  let rvRead  = ReactiveFieldRead getter notifier
+      rvWrite = ReactiveFieldWrite setter
+                          
+  return (rvWrite, rvRead)
+
+-- | Create an RV that processes the value
+-- with an SF every time it is written.
+yampaReactive :: a -> SF a a -> IO (ReactiveFieldReadWrite IO a)
+yampaReactive initial sf = do 
+  mvar <- newCBMVar initial
+
+  -- Initial clock
+  initialClock <- getCurrentTime
+  lastTimeR    <- newIORef initialClock
+
+  -- Reactimation Handle
+  rh <- reactInit
+          -- Initial value
+          (readCBMVar mvar)
+          -- Actuation
+          (\_ changed output -> do when changed $ writeCBMVar mvar output
+                                   return False
+          )
+          -- Processing
+          sf
+
+  -- RV fields
+  let getter   = readCBMVar mvar
+      setter y = void $ do -- Calculate time delta
+                           newTime  <- getCurrentTime
+                           lastTime <- readIORef lastTimeR
+                           let dt = realToFrac $ diffUTCTime newTime lastTime
+                           writeIORef lastTimeR newTime
+
+                           -- Run FRP system
+                           react rh (dt, Just y)
+
+      notifier = installCallbackCBMVar mvar
+                          
+  return $ ReactiveFieldReadWrite setter getter notifier
+
+-- | Alternative (simpler) definition to 'yampaReactive'
+yampaReactive' :: a -> SF a a -> IO (ReactiveFieldReadWrite IO a)
+yampaReactive' initial sf = do
+  (rvW, rvR) <- yampaReactiveDual initial sf
+  return $ combineRVReadWrite rvR rvW
+
+-- | To be moved to Data.ReactiveValue
+combineRVReadWrite :: (ReactiveValueRead r1 a m,  ReactiveValueWrite r2 a m)
+                   => r1 -> r2 -> ReactiveFieldReadWrite m a
+combineRVReadWrite rvR rvW = ReactiveFieldReadWrite setter getter notifier
+  where getter   = reactiveValueRead rvR
+        setter   = reactiveValueWrite rvW
+        notifier = reactiveValueOnCanRead rvR
+