Pattern Lab
Mixer + amp labBody beatmovement source - pat clap stomp snap
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Production lab
Music AcademyMixer Lab
Use faders, pan, filter, drive, delay, compressor, master level, and oscilloscope feedback as one studio signal path.
Mixer + amp lab
Mix the lesson like a small studio.
Each channel is generated in Web Audio, then routed through real gain, filter, drive, pan, fader, delay, compressor, and master output nodes.
SourcePreampFilterDrivePanFaderDelayCompressorMaster
Processed signal monitorAnalyserNode scope - meter 0%
Drum groovetime engine - kick snare hat
Bass ampharmony floor - root fifth octave
Mallet melodytune shape - C D E G A
Channel strip trainerShape tone, then control peaks.
Select one mixer channel, adjust low, mid, and high EQ, then set compression so the loud moments sit in the mix without chasing volume.
Automation laneDraw control movement over time.
Opens and closes the mallet melody filter so learners hear bright versus covered tone over time.
Production course
Sound travels through hardware before it reaches the ear.
9units47hardware items12surfaces
Signal pathSource to ear as one traceable system.
Control surfaceProfessional knobs and meters made learnable.
sourcemicrophonecablepreampmixereffectsamplifierspeakerroomear
Hear how vibration becomes pitch, noise, and timbre before any mixer is involved.
voicestringdrum headpickup
Attack-shape card with one source, one material, and one listening clue.Understand why quiet microphone signals need clean gain before mixing.
dynamic microphonecondenser microphoneXLR cableaudio interface preamp
Gain staging note with quiet, clear, distorted, and feedback-fixed examples.Trace a sound from input hardware through preamp, EQ, compressor, interface, aux send, monitors, and headphones.
XLR cableDI boxaudio interfacemonitor controller
Signal-flow map naming every stage, one feedback fix, and one safe gain decision.Route one sound through filter, drive, pan, fader, and mute or solo decisions.
mixerchannel striplow shelf EQmid peaking EQ
Mix decision card naming the control, audible result, and reason.Use delay, compression, saturation, and filtering to shape the same musical idea responsibly.
delay pedalcompressorampeffects rack
Dry/wet comparison with one production choice that supports the composition.Connect the final electrical signal to moving speakers, room reflections, and hearing safety.
power amplifierstudio monitorPA speakerheadphones
Safe-listening checklist with master level, listening device, and room note.Separate performance data from audio signal, then automate one musical parameter over time.
MIDI keyboardpad controllercontrol surfacecomputer
Automation lane sketch with start value, end value, and musical purpose.Build an original sound by choosing a source, routing modules, and explaining how each stage changes the signal.
synthesizersamplerpatch bayLFO
Patch note with source, route, parameter move, and audible result.Shape a source through preamp gain, tone stack, cabinet filtering, room reflections, limiting, and safe master level.
preampspeaker cabinettone stackroom reflections
Amp tone card with cabinet, gain, tone, room, and safe-listening decision.Control surfacesProfessional tools made learnable
GainNode, StereoPannerNode, BiquadFilterNode, WaveShaperNode, DelayNode, DynamicsCompressorNode
Open MixerBiquadFilterNode lowshelf, BiquadFilterNode peaking, BiquadFilterNode highshelf, DynamicsCompressorNode, StereoPannerNode, GainNode
Open Channel StripAnalyserNode with canvas waveform drawing
Open OscilloscopeAudioParam.setValueCurveAtTime on GainNode, BiquadFilterNode, StereoPannerNode, or DelayNode send gain
Open Automation LaneGainNode into WaveShaperNode plus master output gain
Open Amplifierexplicit Web Audio node graph and signal-chain labels
Open Patch BayGainNode fault stage, WaveShaperNode clipping, OscillatorNode rumble, BiquadFilterNode, DynamicsCompressorNode, DelayNode, StereoPannerNode, and AnalyserNode
Open Signal Flow RackWeb Audio source and processing graph ending in a safe master destination
Open Audio InterfaceOscillatorNode feedback tone, BiquadFilterNode notch, GainNode monitor stage, and DynamicsCompressorNode limiter
Open Feedback TrainerOscillatorNode, BiquadFilterNode, GainNode envelope, and LFO-routed AudioParam modulation
Open SynthesizerAudioBufferSourceNode feeding the patch-bay filter, envelope, delay, and drive chain
Open SamplerWaveShaperNode, BiquadFilterNode tone stack, ConvolverNode room impulse, DynamicsCompressorNode limiter
Open Cabinet + RoomCommon methodOne Knob, One Ear
Change one parameter at a time so the ear learns causality.
Koydo-built methodSignal Before Song
Teach microphones, cables, preamps, and speakers as a physical system before DAW shortcuts.
Koydo-built methodVisual Ear Loop
Pair waveform feedback with listening so production is not invisible magic.
Common methodCurve as Performance
Automation turns a control move into a repeatable musical performance over time.
Common methodTone Then Dynamics
A channel strip works best when learners first shape frequency balance, then control dynamic peaks without mistaking compression for loudness.
Common methodRights-Safe Reference Listening
Borrow general ideas such as brightness or space without copying recordings, melodies, or arrangements.
Koydo-built methodPatch Before Plugin
Learners understand modern plugins faster when they first trace source, route, modulation, and output as a signal graph.
Koydo-built methodLoud Is Not Better
Amplifier lessons should separate tone color from unsafe volume chasing.
Koydo-built methodTrace Then Turn
A learner should trace where the signal is going before changing knobs, because hardware mistakes are usually routing mistakes first.
Koydo-built methodFault Before Fix
Real studio learning improves when learners hear a broken hardware state, identify the stage, and only then apply the fix.
Koydo-built methodPlacement Before EQ
Feedback is usually an acoustic routing problem before it is an EQ problem; kids should move the microphone and speaker path before cutting frequencies.