Table of contents

1. Digital Audio Basics
2. Recording and Mixising
• Recorded Sound: Sample 1.my_guitar.wav with my crappy guitar and built-in microphone for vaio PCG-505G
• As you've noticed, a built-in microphone for a laptop machine is totally not good for music. The aim for such microphone is basically for voicechat or voicememo. Also this case, I didn't concider the position of microphone. Then the result is like this. You will hear a lot of hiss(some high frequency noise).
• Getting rid of hiss: Sample 2.my_guitar_dehissed.wav by DART pro 98
• It's surely dehissed, but since it removed some high frequency sound, then the characteristic of the guitar acoustic was changed. It sounds like I recorded it with very old equipments, also now the highest note is not clear.
• Mixed with some world music like drum loop and echoed voice: Sample 3.mix.wav by ACID v.2.0
• Mixing is a process that makes some sound pieces together. Sometimes, you notice that what you are hearing can't be heard by others. Actually this time, my_guitar.wav was placed just as a background and it's really hard to hear. But since you know it's there, then you can feel it. The interesting thing is, even so it does make a difference on the sound, the next example shows such differences: Sample 4.mix2.wav by ACID v.2.0
3. Digital Synthesis Basics
4. MIDI
• MIDI is one of the format of describing music. Thus MIDI file is like a sheet music. Computers or synthesizers will play according to the assinments from MIDI file then music happens.
5. Sampling/Additive Synthesis
• Fourier Analysis: Sample 5.output.wav by Probe
• Probe is a software synthesizer. I took a sample from it, and analyzed with spectralab.The result is like this.

• This analysis is done by Fourier Analysis. Basically Fourier Analysis tells us that whatever the wave is, we can decompose such wave into the sum of some trigonometric waves(like sine wave). So the point is if you know the frequency decomposition of the sound, you can create it. The idea of additive synthesis exactly comes from this point.
• Additive Synthesis: Sample 6.sine_440.wav by cool edit pro
• Sample 7.my_additive.wav
1. Granular Synthesis (Thonk)
• Granular Synthesis: Sample 8: gra1.wav Sample 9-1.granula1, sample 9-2.granular2 by granulab, chaosynth
2. Subtractive Synthesis & Filters
• Subtractive Synthesis: Sample 10.white_noise.wav by cool edit pro
• I filtered this white noise into some filters, and these are the result.
1. Low Pass Filter 3000Hz: Sample 11.below3000.wav
2. High Pass Filter 3000Hz: Sample 12.above3000.wav
3. Band Pass Filter between 1000Hz and 3000Hz: Sample 13.bet1000-3000.wav
• The result after several random band  stop filter: Sample 14.my_subtractive.wav
• It was like caving. That's why named subtractive. Notice that since it's made from white noise, there are some unpredictable waves with in the frequency range. It's actually the characteristic of this synthesis.
3. Delays, Time/Pitch Shifting
• Delay: Sample 15.do.wav by fruity loops
• Simple Delay: Sample 16.delay_do.wav
• Very short: Frange, Smapler17: frang_do.wav
• Short: Chorus: Sample 18: chorus_do.wav
4. Modulation Synthesis
• Ring Modulator
• Filters
5. Softwares
• Mixer
• Pro Tools
• Cubase VST
• Synthesizer
• Probe
• Sequencer and Beat Generator
• Fruity Loops
• Re-birth
• Acid
• Wave Editer
• Cool Edit Pro
• Wave Lab
• Other Utility
• DART - noise reduction
• SpectraLab - spectol analysis