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Pole: This word has a number of mathematical definitions, some of which relate to audio, and particularly the design and implementation of filters in audio. Capacitors and/or inductors are often integral components of (analog) filter design due to the way in which they interact with varying frequencies of periodic energy. For example, it is possible to create a low pass or high pass filter by placing a single capacitor in a circuit, assuming there is some resistance (a load) elsewhere in the circuit. This is known as an RC circuit (Resistance and Capacitance). In filter design it is understood that a single RC circuit - a circuit with one capacitor and one resistor - is a one "pole" filter. A two pole filter has two RC circuits, and so on. A one pole filter will generally provide a high or low pass roll off in the neighborhood of 6 dB per octave (accompanied by some phase shift). For example, in a high pass filter the voltage of the signal will be cut in half each time the frequency is reduced by an octave, which corresponds to a reduction of 6 dB according to the formula 20log (V1/V2). A two pole filter will have a steeper roll off of 12 dB per octave. The more poles in a filter the steeper the roll off. In a band pass filter more poles equates to a higher Q. If one were to create a resonant filter, as is common in synthesizers (and wireless communication systems (radio, TV, etc.)), more poles would equate to a higher degree of resonance around a more narrow range of frequencies. All of these concepts are clearly related, but applied in different ways. Digital circuits and software can emulate the behavior of poles through certain types of algorithms; however, software can also be written which will mathematically reduce the amplitude of frequency ranges in a manner quite different from "conventional" filters, which can allow for more control over certain aspects of a complex signal and produce a different sonic characteristic.

P-94	p-n Junction	P90
PACE	Pad	PAF
Page	PAIA	PAL
Palm Muting	Palo Escrito	Pan (Panning)
Pancake	Panic Button	Parabolic Reflector
Paragraphic Equalizer	Parallel/Parallel Port	Parameter
Parametric Equalizer	Parasitic Oscillation	Parity
Parlor Guitar	Partial	Partition
Pascal	Pass	Passband
Passive	Passive Radiator	Password
Paste	Patch	Patch Bay
Patch Cord	Patchlist	Patch List
Patch Mapping	Path	Paua
PCB	PCI (Peripheral Component Interconnect)	PCI-X
PCI Express (PCIe)	Pulse Code Modulation (PCM)	PCMCIA
PCM Deck	PD Drive	PDF
Peak	Peak Hold	Peak Power Handling
Pearloid	Pedalboard	Pedal Point
Pedal Steel	Peer-to-Peer	Peghead
Penny Whistle	Pentachord	Pentatonic Scales
Pentium	Pentode	Perceptual Coding
Percussion Switch	Perfect Fifth	Perfect Pitch
Period	Perkins EQ	Permeability
Perpetual Looper	petaFLOPS	PeterGabrielizing
Pre-Fade Listen (PFL)	Phantom Channel	Phantom Image
Phantom Power	Phase	Phase Cancellation
Phase Invert	Phase Lock	Phase Locked Loop
Phase Modulation	Phase Quadrature	Phase Shifter
Phon	Phon	Phone Plug
Phono Plug	Phono preamp	Phosphor Bronze
Photona	Physical Modeling Synthesis	Pianissimo
Piano	Pick	Pick Guard
Pickup	Piezo	Piggyback Amp
Pigtail	Pinch Roller	Pink Noise
Pinna Effect	Pipe Organ	Pitch
Pitch Bend	Pitch Correction	Pixel
Pizzicato	Plainsong	Planar Loudspeaker
Plate	Plate Reverb	Platter
Playhead	Play List	Plectrum
Plenum	Plesiochronous	Plexi
Abbreviation for Phase Locked Loop.	Plosive	Plug-in
Plug and Play	PMPO	Pocket
Pocketing	Podcast	Point-to-Point Wiring
Point Source Monitor	Polarity	Polarize
Polar Pattern	Pole	Pole Piece
Polka	Polyester	Polyphonic
Polyphony	Polyrhythm	Polytonality
Polyurethane	Ponticello	Pop
Pop Filter	Port	Portamento
Portative Organ	Position	Positional Sensing
Post Production	Potential Acoustic Gain	Potentiometer
Potting	POW-r	Power
Power Calibration Area	Power Chord	Power Compression
Power Conditioner	Power Cycle	Power Factor
Power Spike	Power Supply	Power Surge
PPG Wave	Peak Program Meter (PPM)	PPQN (Pulses Per Quarter Note, sometimes Parts Per Quarter Note)
PQ Subcode	P-Ram - (a.k.a. PRAM)	Pre-bend
Pre-delay	Preamp	PrecedenceEffect
Pre Fade/Post Fade	Preference File	Premiere
Prepolarization	Presence	Preset
Pressure-gradient Microphone	Pressure Microphone	Pressure Wave
Presto	Primary Tones	Princess Ensemble
Print	Print-Through	Producer
Program-dependent Compression	Program Change	Progression (Chord)
Progressive Hammer Action	Progressive Scan	Project-O-Sonic
Propagation	Proprietary	Protocol
Proximity Effect	PS/2	Psychoacoustics
PTP	Public Performance Right	Pull-off
Pull Down	Pulldown Menu	Pulse
Pulse Wave	Pumping	Punch
Punch Block	Punch In	Pure Tone
Purfling	Purple Heart	Push-Pull