Synthesiser Report This report is to explain the process of how the synthesisershave been designed and looking at the way I approached the audio demonstration.
Code Snippets used from previous labs:- ADSR Envelope Lab 1 1- Guts for the FM Synth 2- Guts for the Subtractive Synth 3These snippets were made by me but produced from the guidanceof the documentation in the lab scripts. Subtractive Synthesiser Thissynth was designed to use two oscillators with different frequencies to createdepth in the sound. The Synth uses a Low Pass filter, High Pass and VCF.
Thesynth output audio through the VCF then the High Pass filter then the Low Passfilter. I designed the synth with anADSR filter which can be modified by going into the patch ADSR or by changingthe values in the qlist. The synth a play button to play the note with theenvelope, and a play with no decay button which plays the synth with no decay.
This is useful for finding the sound that you want the synth to produce. FM Synth ThisSynth has been designed with 1 main oscillator and 3 modulating oscillators.The modulating oscillators have ratios which are predefined. However, they canbe manually changed in qlist or by going into the “fm_synth” patch. In addition, each oscillator has an individualADSR (attack, decay, sustain, release) envelope to produce different developingsounds.
I haveadded 5 different preset sounds to the patch:1. OrganStyle2. ElectricPiano with no pedal3.
DevelopingPad4. LightBrass instrument with short release5. ShorterPadEach ofthese preset sounds have a custom ADSR envelope with both each individualmodulator envelope changing and the main envelope being changed. The FMSynth outputs its voice through the panning module which then goes through tothe master volume to control the main volume of the synthesiser. I originallyhad a reverb module which is left in however I disconnected it from the outputrouting because it didn’t add anything to the synth’s feel. Audio Demonstration Whenmaking my audio demonstration I was heavily inspired by the Netflix SeriesStranger Things, the intro to which uses a synthesiser. I decided to take the approachof a musical sound scape which experiments through some of the different soundsthe synths can create.
Thedemonstration starts off with the FM synth on the “developing pad” presetplaying notes and allowing the sound to expand through space. On the final note,the subtractive synthesiser starts playing an arpeggiated pattern slowlyincreasing in volume as the FM synth fades away. It then ends by changingsounds and going to the subtractive synthesiser playing the different sound.This sound was produced by changing the LFO amount and the filters.
The sectionplayed on the subtractive synthesiser is ended by the FM synthesiser playingits developing pad sound. The piece then moves on to play the FM synthesiser ona repeating pattern changing voice each time. The piece uses panning to movethe sounds around the listeners head. Bibliography 1 Advanced: ADSR-Envelope. Available: https://www.elec.
york.ac.uk/internal_web/meng/yr1/modules/Audio_Technology/02_additive_synthesis/06_ADSR.html 2 FM Synthesis in PD. Available: https://www.elec.york.
ac.uk/internal_web/meng/yr1/modules/Audio_Technology/04_FM_synthesis/01_contents.html 3 Subtractive Synthesis in PD. Available :https://www.
html 4 Frequency Modulation. Available: http://write.flossmanuals.net/pure-data/frequency-modulation/