Alternatively, high-pass filter the output from the delay. A 12dB-per-octave high-pass filter set at about 150Hz should do the job, but this figure isn't critical and will affect the subjective stereo effect, so experiment. Ideally, high-pass filter the signal before the delay. Take an aux output of the mono signal and route it to a digital delay. Here's how to do it practically: take the mono signal and route it to both outputs on the mixer equally, or, in other words, pan it to the centre. The longer the delay, the greater the perceived room size - but I would only recommend delays over about 20ms for orchestral or choral music. This fake 'S' signal is simply the original mono signal, high-pass filtered (to avoid the bass frequencies being offset to one side of the stereo image) and delayed by any amount between about 7ms and 100ms, according to taste. You'll need to treat the mono source as the 'M' element of an M&S stereo matrix, and decode accordingly, having created a fake 'S' component. One of the best ways to create fake stereo from mono is to make an M&S (Middle and Sides) stereo mix from the mono source. In other words, there is nothing you can do to separate instruments and pan them to specific points in the stereo image, as you could if mixed originally for stereo. Technical Editor Hugh Robjohns replies: The first thing to accept is that you cannot create a true stereo (or surround) mix from mono material you can only give an impression of greater width. Can you offer any advice or suggest any tricks to achieve this? I want to remix some old mono tracks in stereo.
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