Per registrare con un limite di tempo puoi ritardare il messaggio "stop" con l'oggetto [delay] (vedi patch allegata).
Puoi cambiare i colori della tastiera nell'inspector, ma non è che puoi fare gran che.
Creare interfacce personalizzate (se ho capito bene cosa intendi per "inserire nel tastierino i tasti stop rec e play") non è una cosa immediata, puoi dare un'occhiata a questi tutorial:
http://cycling74.com/docs/max5/tutorials/max-tut/interfacechapter02.htmlhttp://cycling74.com/docs/max5/tutorials/max-tut/javascriptchapter04.htmlil secondo tutorial prevede la conoscenza di javascript.
<pre><code>
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-----------end_max5_patcher-----------
</code></pre>