I am planning to design a simple 5 to 6 inputs audio mixer with an output of around 300mV at 1kHz with an input signal of about 0.6mV. Supply voltage is around 12 to 18V DC. I intend to use the commonly available LM324 quad opamp. Is there anybody in the community who has used this IC for such audio purposes? What are the pros and cons of using this IC? I have heard that the LM324 is not suitable for audio work; but since it is freely available and very cheap, and since the mixer is not going to be a high end equipment, can I use it safely? Any help would be gratefully accepted. Thanks to all in advance. C.M.