This may seem like a simple question, but can I attach two headphones to the DP 24 for recording? I'm going to record a friend soon and first we'll record his acoustic guitar. Then we'll record the vocals, but for him to sing along to the guitar track I'd want him to have headphones to listen along to the guitar, but I'll also need headphones while recording him. There is just one headphone jack at the front of the console. How can I add a second set of headphones for him to listen to?