Keyboard Instrument Sampling (Piano's etc)
Introduction
When sampling a piano or keyboard instrument it really comes down to a few key factors, microphone types and positions (if it's not digitally connected) are fundamental, how many notes do you sample, how many times is the note sampled and at differing velocities for different character (known as Round Robins) and if we process before recording (PRE) through some effects of choice. A simple way would be to sample every octave (12 semitones), however the best method is the following:
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Sample through the Cycle of fifths (every 7 semitones)
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Sustain pedal down (everything sounds better with sustain)
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Two velocity layers (notes play quiet and played loader)
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Release triggers (the sound of the key being released)
NB: as mentioned we could sample each cycle 3-4 times for subtle differences, our sampler would then select from each multiple note recorded differently every time it is triggered, this is know as a Round Robin, giving the feeling of a more 'Human' performance as oppose to the same sample playing over and over.
Recording your Piano
To record your piano you will need a pair of microphones (to capture a stereo image), an audio interface plus DAW or an audio recorder, and a DAW to cut up your samples.
Most recordings of pianos make use of one or more stereo pairs of condenser microphones – anything from a pair of large diaphragm condensers or a simple pair of small diaphragm condensers. Whilst Condenser microphones are typically used, you could get great results from something like a Shure SM58. Microphone placement and polar pattern will depend on the particular piano, the room and whatever sounds best to you
You will be recording the piano multiple times across a cycle of fifths, starting at the low C(0) and ending at the top F(6). The complete cycle (C0, G0, D1, A1, E2, B2, F#3, C#4, G#4, D#5, A#5, F6) is shown below.
To capture the piano, start a recording into your chosen device, for best results we would suggest recording at 48khz 32bit(float), if you cannot go this high then 44.1khz 24bit will suffice. Don't record any higher level wise past -6db, or lower than -18db. Capture each note for long enough as to include its tail (attentuation) to -60db. The amount of time you will need to play each note will decrease as you move up the keyboard because the higher notes tail off quicker. Finally, be sure to capture the piano with the sustain pedal down, ensure you engage the pedal before striking the note and then carefully lift the pedal after you have released the note.
When you have completed a first cycle of recordings, play the whole cycle of fifths again but at a louder velocity. You may need to experiment to find the optimal “quiet” and “loud” versions that capture the sound you like the best. Remember to try to keep the volume the same for all samples in a particular layer.
Following the recording of the “quiet” and “loud”, capture the release triggers of each note in the cycle of fifths, which can be used to add realism to the virtual version of your piano. To capture a release trigger, press down the key (without the sustain pedal) but don’t let the hammers strike the strings. Then simply release the key – slightly more exaggerated than you might normally (it’s easier to turn down the sample than turn it up).
Finally, capture at least 30 seconds of “room tone”, sitting in silence to capture the rooms noise, which will be helpful when processing through noise reduction at a later stage.
You may want to repeat the whole process multiple times so that you can pick your best take or even mix and match across takes if one note doesn’t quite work from one of your takes, the sample the better your choice of 'Round Robins'
Noise Reduction
After recording your samples now would be a good time to noise reduce your recordings before editing, you can do this after editing to as a batch process if you have the correct software such as Izotope RX, we like to do it before editing (chopping) but the outcome is the same, to noise reduce you will be using your 'room tone'. See our 'Noise Reduction' Video HERE (4:04mins). If you still need help after watching our video then please reach out to the community.
Editing the Samples
After recording your samples it’s time to cut them up so they can be loaded into a sampler. Most DAWs have a function to cut an audio file at transients and this is the easiest way to slice up your recording into the individual notes. Check out our quick video demo of this HERE, we have used Logic Pro but it would be the same in most DAW's.
When naming your samples, make sure you include the name of the note (using sharp ‘#’ signs rather than flat ‘b’ signs) to make it possible to auto-map your samples into a sampler (most don't recognise the 'b' flat extension. Also include the velocity layer in the name or “RT” for release tiggers. If possible, files should be saved at 48khz, 24bit, wav. A full recorded set of samples will look similar to the following:
Name p C0.wav
Name p G0.wav
Name p D1.wav
Name p A1.wav
Name p E2.wav
Name p B2.wav
Name p F#3.wav
Name p C#4.wav
Name p G#4.wav
Name p D#5.wav
Name p A#5.wav
Name p F6.wav
​
Name f C0.wav
Name f G0.wav
Name f D1.wav
Name f A1.wav
Name f E2.wav
Name f B2.wav
Name f F#3.wav
Name f C#4.wav
Name f G#4.wav
Name f D#5.wav
Name f A#5.wav
Name f F6.wav
​
Name RT C0.wav
Name RT G0.wav
Name RT D1.wav
Name RT A1.wav
Name RT E2.wav
Name RT B2.wav
Name RT F#3.wav
Name RT C#4.wav
Name RT G#4.wav
Name RT D#5.wav
Name RT A#5.wav
Name RT F6.wav