essential elements of a SocketStream main app file that integrates Express within the Ss stack:

SocketStreamExpress.iced

http= require 'http'
ss= require 'socketstream'

express= require 'express'
metro= express()

connectRedis= require 'connect-redis'
redisStore= connectRedis express

metro.use express.json()
metro.use express.bodyParser()
metro.use express.urlencoded()
metro.use express.static(__dirname + '/public')
metro.use express.cookieParser('someSecret')
metro.use express.session store: new redisStore(),secret: "someOtherSecret"

ss.session.store.use 'redis'
ss.publish.transport.use 'redis'

server= http.createServer metro

ss.start server
metro.stack= ss.http.middleware.stack.concat(metro.stack)
server.listen 3000

someExpressRoute.iced

  metro.get '/download', (req, res)->
    queryStuff= req.query.stuff
    # do stuff
    filename= "someFilename"
    res.sendfile filename

This works with:
"express": "3.x",
and
"connect-redis": "1.4.7"