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DSP's Forgotten Feature - Signal Summing Hacks!

When you install an aftermarket car audio system you may want to use a phone or a high-res player as sort of an auxiliary input, but your source unit may not allow for this which means you may need to send signal directly into the amplifier. If you do so, how can you set up a DSP system to keep some sounds from the existing head unit, while still using the auxiliary device as the main system sound? Let's discuss!

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