I am trying to build myself a very simple audio mixer that can take 3 line-level inputs and create a single output for a set of powered PC speakers. I found a schematic online (here) which I have tried to copy as closely as possible. My main question is about the power supply. I am assuming I can use +-12V for the TL072 op-amps, but I wasn't sure what the best way to do it is, I found this handy page that describes a few methods and I thought I'd use the one that utilises the TLE2426 since it seems so easy. Can someone please advise if I have implemented this correctly? Hopefully the schematic below is of good enough quality. Again, I want this to be very simple in design, but obviously if I have done something wrong then I'd really appreciate the heads-up. Thanks!
EDIT - I forgot to say that one concern of mine was the low current capacity of the TLE2426 (maybe 20-40mA) so would this be a problem in this case?