Algorithm creation is something of an expert-level task, so we have little basic information. If you haven't already, try the following:
Programming Manual for Harmonizers
Omnipressor: Anatomy of a Preset
Once you have moved on from these, try picking a few factory presets that look useful, and take them apart and see how they work.
Your synthesizer should be do-able, with PITCHDETECT, OSCILLATOR and MIXER. But, the skill will be in making it playable.
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