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https://github.com/thestk/stk
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104 lines
3.0 KiB
C++
104 lines
3.0 KiB
C++
/***************************************************/
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/*! \class HevyMetl
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\brief STK heavy metal FM synthesis instrument.
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This class implements 3 cascade operators with
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feedback modulation, also referred to as
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algorithm 3 of the TX81Z.
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Algorithm 3 is : 4--\
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3-->2-- + -->1-->Out
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Control Change Numbers:
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- Total Modulator Index = 2
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- Modulator Crossfade = 4
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- LFO Speed = 11
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- LFO Depth = 1
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- ADSR 2 & 4 Target = 128
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The basic Chowning/Stanford FM patent expired
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in 1995, but there exist follow-on patents,
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mostly assigned to Yamaha. If you are of the
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type who should worry about this (making
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money) worry away.
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by Perry R. Cook and Gary P. Scavone, 1995 - 2007.
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*/
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/***************************************************/
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#include "HevyMetl.h"
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HevyMetl :: HevyMetl()
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: FM()
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{
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// Concatenate the STK rawwave path to the rawwave files
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for ( unsigned int i=0; i<3; i++ )
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waves_[i] = new WaveLoop( (Stk::rawwavePath() + "sinewave.raw").c_str(), true );
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waves_[3] = new WaveLoop( (Stk::rawwavePath() + "fwavblnk.raw").c_str(), true );
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this->setRatio(0, 1.0 * 1.000);
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this->setRatio(1, 4.0 * 0.999);
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this->setRatio(2, 3.0 * 1.001);
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this->setRatio(3, 0.5 * 1.002);
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gains_[0] = fmGains_[92];
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gains_[1] = fmGains_[76];
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gains_[2] = fmGains_[91];
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gains_[3] = fmGains_[68];
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adsr_[0]->setAllTimes( 0.001, 0.001, 1.0, 0.01);
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adsr_[1]->setAllTimes( 0.001, 0.010, 1.0, 0.50);
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adsr_[2]->setAllTimes( 0.010, 0.005, 1.0, 0.20);
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adsr_[3]->setAllTimes( 0.030, 0.010, 0.2, 0.20);
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twozero_.setGain( 2.0 );
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vibrato_.setFrequency( 5.5 );
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modDepth_ = 0.0;
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}
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HevyMetl :: ~HevyMetl()
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{
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}
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void HevyMetl :: noteOn(StkFloat frequency, StkFloat amplitude)
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{
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gains_[0] = amplitude * fmGains_[92];
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gains_[1] = amplitude * fmGains_[76];
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gains_[2] = amplitude * fmGains_[91];
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gains_[3] = amplitude * fmGains_[68];
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this->setFrequency( frequency );
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this->keyOn();
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#if defined(_STK_DEBUG_)
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errorString_ << "HevyMetl::NoteOn: frequency = " << frequency << ", amplitude = " << amplitude << '.';
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handleError( StkError::DEBUG_WARNING );
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#endif
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}
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StkFloat HevyMetl :: computeSample()
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{
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register StkFloat temp;
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temp = vibrato_.tick() * modDepth_ * 0.2;
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waves_[0]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[0]);
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waves_[1]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[1]);
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waves_[2]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[2]);
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waves_[3]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[3]);
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temp = gains_[2] * adsr_[2]->tick() * waves_[2]->tick();
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waves_[1]->addPhaseOffset( temp );
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waves_[3]->addPhaseOffset( twozero_.lastOut() );
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temp = (1.0 - (control2_ * 0.5)) * gains_[3] * adsr_[3]->tick() * waves_[3]->tick();
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twozero_.tick(temp);
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temp += control2_ * 0.5 * gains_[1] * adsr_[1]->tick() * waves_[1]->tick();
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temp = temp * control1_;
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waves_[0]->addPhaseOffset( temp );
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temp = gains_[0] * adsr_[0]->tick() * waves_[0]->tick();
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lastOutput_ = temp * 0.5;
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return lastOutput_;
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}
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