Making Music
  Computer Music Software and Hardware

Mixing MIDI and audio

One of the great things about computer-based recording is that the parts can so easily be changed, edited and processed. It's also so easy to combine MIDI and audio tracks and many musicians use a combination of sample loops, MIDI parts and audio recording.

Audio recordings are generally guitar and acoustic instruments such as the sax and vocals. Incidentally, the best way to record guitars is by sticking a Mic in front of its speakers. You can DI them and process them later and this may be cleaner but for a natural guitar sound a Miced amp is hard to beat.

It's not necessary to record drums live and, in fact, it's difficult to do and retain a modern sound. You can buy off-the-shelf MIDI drum riffs and audio drum loops, or program your own. The quality of the gear which makes drum noises these days is such that anyone with a good riff can sound like a pro.

MIDI Mixing

As MIDI and audio parts appear on the same screen in modern sequencers, it's very easy to arrange them into a song. However, when you come to mix everything down there's another consideration. If you are recording to DAT you can simply route the audio and MIDI outputs through a mixer and into the DAT machine.

However, if you want to create a CD you must first convert the MIDI parts to audio data. The entire song can then be mixed to hard disk and burned to CD. Converting MIDI to audio can have another benefit and that's the ability to process the MIDI tracks using digital effects.

Effects

There are three positions for effects known as Master, Send and Insert. Use the Master for effects you want to apply to the entire mix. These will often be EQ, compression and reverb.

Although giving each channel its own Insert effects is kinda neat, each one uses a corresponding amount of CPU power. So if your computer is struggling and if you're using the same effect on more than one channel, make the effect a Send effect and route those channels to it.

Many pieces of software let you apply an effect Pre or Post fader. With Post fader, the amount of sound sent to the effect is controlled by the fader. With Pre fader, the total volume level of the signal is sent. Post fader is the usual default and the one you'll use the most.

EQ

EQ is the most popular and the most over-used effect. Yes, it can be used to try to "fix a mix" but you can't make a silk purse out of a sow's ear as me Gran used to say and what she didn't know about mixing could be written in the margin of the book of honest politicians.

But before you start messing with EQ - or any other effect for that matter - make sure you have a decent set of speakers. Have we said that already? Oh, must be important, then.

There are plug-in effects such as MaxxBass which can psychoacoustically enhance the bass frequencies to make it sound better on smaller speakers. However, this is by no means the same as getting a good bass sound in the first place by observing good recording principles.

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