i have two questions

first is about the self oscillation of the filter part...how do you make it self oscillate? to understand what it says there in the red rectangle box i placed

also

is there any way to determine what will be the lowest and highest point of filter when setting the keytrack or its more or less random?

i.e I thought the point u set the cutoff would be lowest...and the point where you set the keytrack would be the highest point of cutoff, or something like that

 

Like most of your other questions, an in depth explanation will only confuse you more. My advice to you is to obtain a basic, cheap analogue hardware synth. As long as it has a knob per function layout, something like filter self oscillation will become instantly clear to you. As will so many of the myriad problems you encounter with soft synths. Plus you will truly enjoy the adventure of discovery.

 

Hi @petrrr, only the oscillator (OSC) is the sound generator, it oscillates as the name implies.
There are also VCO's called Voltage Controlled Oscillator.
A filter as the Nane already says filters, it filters out certain components.

Working with keytrack is usually not useful because keytrack is hard to calculate. I would leave out Keytrack. If it is too bright and harsh try to transpose it down octave minus 1-2 and / or semi - 12, Sylenth has an EQ there you can also adjust something. Lowpass Filter 12 / 24 dB (LP) 60-75 & Resonance 0-15 %.

Keytracking
This control has different names on synthesizers from different manufacturers. It can be called Key Follow, Key Track,
Keyboard Track, KB Track, KB Amount, Keyboard or simply Key, and these are certainly not all of them.

However, regardless of the label, its effect is always the same. Keytracking causes the filter's cutoff frequency
to be affected by the position of the key played on the keyboard (or by the pitch of incoming MIDI note messages).
In this way, you can make low notes have a lower cutoff frequency than higher notes.

Keytracking - like many other functions of a synthesizer - has its origin in acoustic instruments, which the inventors of the first synthesizers tried to imitate. Many acoustic instruments, especially wind instruments, have a duller sound in the lower registers than in the high registers. Keytracking can be used to simulate this behavior on a synthesizer, often resulting in a more natural, organic sound.

Keytracking is often continuously adjustable, but on some synthesizers it can only be switched on or off.

Self-oscillation
Depending on their design, some analog filter circuits begin to self-oscillate at high resonance values and produce a sine wave at the cutoff frequency. This is called self-oscillation. If at the same time the input signal of the filter (i.e. the oscillator(s)) is cut down to 'zero', only this sine oscillation remains.

Filter
In a subtractive synthesizer, the filter is used to shape the fundamental waveforms generated by the oscillators into the final sound. It removes certain frequencies from the sound, affecting the overtone structure and thus the timbre of the sound. Different filter types such as low-pass, high-pass and band-pass filters differ in whether frequencies above, below or on either side of the adjustable cutoff frequency are filtered out. The Resonance control can be used to emphasize the area around the cutoff frequency.

Source: www.bonedo.de/artikel/synthesizer-und-sounddesign-2-filter/

 

Last edited: Aug 28, 2022