Authentic Virtual Analog Drum Synthesis Implementation

[Pitrat-wav]

This PR implements high-fidelity virtual analog drum synthesis for the TR-808 and TR-909 kits, based on deep DSP analysis of the original hardware circuits.

Key improvements:

• 808 Kick: Accurate Bridged-T emulation with rapid pitch envelope for the characteristic 'tonk' attack.
• 909 Kick: Triangle-wave body with deep pitch sweep (4.7x base) and high-passed noise click layer.
• 808 Snare: Dual-mode membrane resonance (238Hz/476Hz) and phase-aligned "snappy" noise.
• 909 Snare: Triangle-wave punch and bandpass-filtered noise for the 909-specific crunch.
• 808 Hi-Hats: 6-oscillator metallic matrix (Schmitt trigger matrix) with parallel bandpass filtering.
• Analog Drift: Per-hit micro-randomization of pitch, filters, and envelopes to prevent the "machine-gun" effect.
• Saturation: Master bus tanh-based soft-clipping with 4x oversampling for "gluing" the kit together.
• Euclidean Rotation: Added support for shifting drum patterns in the sequencer.

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PR created automatically by Jules for task 3860972422394535554 started by @Pitrat-wav

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