ACOUHYB Tuning Guide


Parallel Tuning for Acoustic Pianos Using the ACOUHYB System

The ACOUHYB system is an innovative tuning technique that allows two distinct tunings to coexist within a single acoustic piano. This creates a new timbral richness and harmonic depth not possible with traditional tuning.


 What You’ll Need:

• 2 electronic devices (smartphones or tablets)
• → Each with the Pano Tuner app (or any real-time frequency tuner)
• 4 elastic rubber string spacers
• → Used to isolate strings during tuning
• 1 piano tuning lever

 Step-by-Step Instructions:


1. Set the Tuners
Open the tuning app on both devices.

• On Device 1, set A = 440 Hz
• On Device 2, set A = 439 Hz
• This will create a 1 Hz difference, forming a parallel tuning between the two outer strings.

2. Tune Each Note in the Treble Register

• Tune the left string of each note using Device 1 (440 Hz)
• Tune the right string of the same note using Device 2 (439 Hz)

3. Tune the Middle Strings

• The center string of each note should be tuned in unison with the left string (440 Hz).

4. Tune the Bass Normally

• The bass register is tuned according to traditional methods and is not modified in the ACOUHYB system.

5. Fine Adjustments

• Play the notes chromatically and listen carefully.
• Adjust for harmonic speed consistency between the pairs so that the parallel tuning effect is smooth and even.

 Final Result:


You now have a parallel tuning timbre with a 1 Hz offset — producing a gentle, shimmering effect in the treble range.

This technique can also be applied with larger intervals, such as 4 Hz, 8 Hz, etc., simply by adjusting the Hz values on your devices accordingly.que can also be applied with larger intervals, such as 4 Hz, 8 Hz, etc., simply by adjusting the Hz values on your devices accordingly.