Here a list of very useful websites that I love.
Feel free to add more website to this list.
The ones you love..
Online Audio Editor
Twistedwave is an audio editor for Mac, iOS and Online!
(My favourite one!
Online Screen Recorder, Audio Recorder, Video Converter & More
Lot of cool things here!
Online Audio Converter
cloudconvert is a really useful website, for audio, video, and any types of documents.
218 formats supported
CloudConvert supports the conversion between more than 200 different audio, video, document, ebook, archive, image, spreadsheet and presentation formats. Check the supported formats for more details.
Most conversion types support advanced options, for example setting the codecs of audio/video files. Also, we support batch converting and folder monitoring!
The CloudConvert API offers the full functionality of CloudConvert and makes it possible to use the conversion services in your own applications.
File conversion la the cloud
There is no need to install any software on your computer! Upload your files to CloudConvert and we will do the job for you. Don't worry, your files are safe and only you can access them. They will be deleted again as soon as your conversion is finished.
Youtube, Soundcloud & More to mp3
Anything 2 mp3
This website helps me a lot for my job of casting editor...
Sometimes I have to download a video from Video or Daylymotion with my iPad.. Not so easy even with iCab (the best iOS browser)
MIDI Note to Note and Frequencies & 100 more!
This website is just awesome...
So useful for musicians, sound engineers....
Sound level SPL, pressure, pascal, and intensity level (SIL) conversionSpeed of sound in air and the significant temperature calculationTable of sound pressure levels − Sound pressure and intensitySpeed of sound (velocity of sound) in humid air calculationMicrophone sensitivity conversion dB re 1 V/Pa − Transfer factor mV/PaSpeed of sound, the temperature, and not the air pressureVoltage (volt) to level dBu and dBV conversion and vice versaTemperature dependence of acoustic quantitiesSound pressure, particle velocity, impedance, sound intensity calculationRoom modes calculation − Axial, tangential, and oblique modesElectrical voltage, current, resistance, and power calculationStanding waves on a string and room modes between parallel wallsFormula Wheel of Acoustics − Most important FormulasRoom modes − Standing waves in air − Bass reflections at wallsFormula Wheel of Electro Engineering − Most important formulasRoom modes and vibrations of strings compared - Standing wavesFrequency ratio (interval) to cents conversion and vice versaComb filters − Dips and peaks − Delay time and Interference (ITDG)Period, cycle duration, periodic time to frequency calculationBandwidth in octaves to Q factor (filter) conversion and vice versaHarmonics and Overtones, calculated from the FundamentalQ Factor and filter center frequency − Find −3 dB cutoff frequenciesThe decibel calculator (dB) − A valuable toolFilter slope or steepness (dB/oct) is really not bandwidthThermal noise calculation − Johnson noise − White noise calculatorVoltage V to dBu, dBV, and dBm − power level dBm calculatorTime constant and cut-off frequency conversion − Equalization (EQ filter)Reverb time RT60 after Sabine calculation − room acoustic parameterRC filter cutoff frequency and time constant calculationReverberation time RT60 to Sound decay rate conversionAdding decibels − Combining up to ten (10) acoustic levelsAbsorption coefficients of building materials and finishesAdding decibels − Combining up to thirty (30) sound levelsDegrees Celsius and Fahrenheit − Temperature comparisonSones and phons loudness conversion and the problem with dBAMeasurement of input impedance and output impedance● Interconnection of two audio units − Voltage bridging − Zout < ZinALcons and STI speech − Intelligibility conversionLevels in decibels and references of sound quantities − CalculationXLC reactance calculator with frequency● Total level in decibels − Adding of incoherent sound sources Voltage divider calculation − Open-circuit and loaded circuit● Total level in decibels − Adding of coherent electrical signalsVoltage divider calculation − Unloaded (voltage drop)Geometric mean − Arithmetic mean − Calculation of the center frequencyPressure units − Calculation and conversion● Sound and distance − Sound pressure and sound intensityFrequency domain of musical instruments, voices (vocals), and keyboards● Damping (decrease) of sound level with distance r (noise propagation)Magnetic flux in nWb per meter and conversion to flux level in dBTime difference Δ t and sound path d distance conversionRelationship of acoustic quantities − Plane progressive sound waveFrequency to wavelength conversion and vice versa (sound and light)Bits and bytes conversion − Kibibits and other prefixesWavelength of an acoustic wave in air calculation (sound waves)Resistor color code calculator − Values with 4 or 5 color bandsBel to decibel conversion and more ... (Level Prefixes Conversion)Data transfer rate units conversion − Bits per second = bps● Factor, ratio, gain to a level value conversion (Gain, decibels, dB)Air damping formulae (High frequencies / Dissipation) calculationAmplification (gain) and damping (loss) in dB − ComputationExtension angle of the orchestra calculation (microphone position)Decibels to voltage gain / loss conversion − Amplification / dampingFletcher-Munson is not Robinson-Dadson − ISO 226:2003Decibel (dB) calculation − Amplification and damping − Gain and lossUnit conversion table − Conversion of unitsdB chart for voltages and powers − Relative level and absolute levelNepers to decibels conversion and vice versaVoltage and power gain calculationL pad for loudspeaker damping calculation − Voltage dividerCapacitive reactance calculator XC (Condenser Capacity)Cross-sectional area to diameter for round wires and cablesAmplitude sum in dB (voltage) and power sum calculationCable length, cable capacity, and the cutoff frequency calculationPhase angle, time delay, and frequency calculationWhy does proximity effect occur? − Shure Pro AudioNormal equal-loudness level contours from 2003 (new)Direction of phantom sources by calculation of Δ L and Δ tgif file: ISO 226:2003 − Normal equal-loudness contours (new)● Compare sound power and sound pressure in a distanceOhm's law − Magic triangle − Calculator and formulaeTony Faulkner's parallel AB figure-of-eight microphone pairLoudspeaker sensitivity to efficiency in percent conversionTony Faulkner's Phased Array microphone system − ReviewPitch change by temperature change (variation) - wind instrumentsFormula symbols of electrical engineering and electroacousticsInternational Level Displays dBu − Digital + analogActive Audio Filter − Low cut, high cut, and bandpassDistortion attenuation dB to THD factor in percent conversionAbsorption of sound by the atmosphere calculationSound pressure and the inverse distance law 1/rDirection of the phantom sources by Δ L and Δ t calculationSound intensity and the inverse square law 1/r²Phantom image sources − Stereo loudspeaker signals 1Number relations (ratio) to decibel (dB) level conversionPhantom image sources − Stereo loudspeaker signals 2Parallel resistance calculator − Find the parallel resistanceHow do Sound Pressure Levels (SPL) add when listening?Resistor pairs − Reverse engineered calculatorInches and centimeters in comparison − Metric and inch rulerComparative representation of basic acoustic quantities − FormulasVisualization of microphone systems − SRA calc of Δ L and Δ tRelationships of acoustic quantitiesSRA calculation of Δ L and Δ t for stereo microphone arrays − flashTuning keyboard frequencies and notes − English and GermanDecrease in level of sound pressure and sound intensity with distanceChord name finder by note name entry − Chord recognitionActive Audio-Filter calculation (Low cut − High cut − Bandpass)Weighting filter calculation − Weighted dBA and dBC − FrequencyTerms of audio engineering and acoustics − English and German● Amplifier, loudspeaker, and ohms − The misunderstood topicdB dBu dBV − Comparison table for PPM and VU meters● Loudness/Volume − Sound level definition and the change of factorsDamping of bridging and damping factor calculation in audio● Sound pressure and Sound power – Effect and CauseCelsius (°C), Fahrenheit (°F), Kelvin (K), and °Reaumur − FormulasRadio frequency to wavelength conversion and vice versaSound pressure level SPL and permissible exposure time for noisegif File: Various microphone connectors (plugs) – Sennheiser MD421Wave graphs calculation − Amplitude, distance and timeVowel triangle − First two formant frequencies as diagram − htmJecklin disc (new) − A stereo microphone array with isolating bafflegif file: Vowel triangle or vowel diagram − The first two frequenciesTrygg Tryggvason: The Decca Tree − Classical Sound Recording● The human perception of loudness − Loudness factor gain ratioDirect field D (Free field) and Reverberant field R (Diffuse field)Combine levels of one-third octave bands to octave bandDavid Griesinger − Man behind reverb algorithmsPressure gradient and phase − M/S signal − omnidirectional patternSengpiel − Mentioned in papers of the AES (Audio Engineering Society)EBS Stereo Microphone System − Equivalence StereophonyBPM tempo and delay to time and frequency − Conversion chart"Live End − Dead End" − Thoughts about the Reflexion FilterBPM − Beats per minute counter and calculator"Kaotica Eyeball" − Singing into a bucketSound pressure conversion direct to Sound intensity and vice versaQuestions to sound waves and the amplitudes − Right answersSurprise − Sound does not come from the stringsAdding amplitudes and levels − Coherent and incoherent signals8 Ohm Output and 150 Ohm Input − What is that?What is amplitude? Which amplitude exactly?Two Different Boundary MicrophoneTypes − Crown PZM● Many Amplitudes − Sound field quantities of a plane waveSound Sound Sound − pressure − sound intensity − acoustic impedanceMusical Terms - Music Glossary Terminology Words (English/German)Recording Angle (SRA) dependend on Axis Angle - X/Y microphoneDecibel (dB) to percentage (%) converter − THD Total Harmonic DistortionExcel calculatiom of localisation direction – X/Y coinzidence microphone Length m, cm, inch, feet and yard − Ruler cm to inch conversionEnglish and American measures to metric conversionsTemperature °F, °C, K, °Rankine and °Reaumur conversionWeight conversion milligram to kilogram and literFormula symbols of electrical engineering and electroacousticsVolume conversion milliliter to liter and kilogramMeasurement Unit Conversions − Unit conversion calculatorTime conversion millisecond and secondBody length and height (size) calculation foot-inch to cm and vice versaLength conversion millimeter and meterQuadratic equation solver Convert angle to tangensPrefixes conversion Temperature unit conversionTime addition calculator − Add time togetherLength unit conversion Time Unit conversionIs this a prime number?Area unit conversion Energy unit conversionHow to calculate logarithms?Volume unit conversion Power unit conversionUnit conversion table − Conversion of unitsWeight-Mass unit conversion Density unit conversionAlphabetical list of conversion factorsPressure unit conversion Acceleration unit conversionSI derived units (SI based units)Force unit conversion Velocity or Speed unit conversion
Online Guitar Tuner
A few years ago, I made its review for Apps4iDevices...
A very good tuner!
This one can work with our tablets...
(For iPhone or iPad use Puffin or Skyfire or any browser which convert a Flash signal....)
For desktop computers
Best Metronome is for Desktop computers. It comes also with a Tap Tempo feature
Online Tap Tempo Calculator
Beats per minute online
A very good one...
Same Same but different
Online Chord Finder
All Guitar Chords
Online Scale Finder
Scales - Chords
Free MIDI Files
Because I can read everywhere a Policy...