How to tune an accordion
with Dirk's Professional Accordion Tuner
The reeds which sound when pressing a key or button of the accordion are
frequently indicated with L, M and H. L stands for the low octave (16'), M for
the middle octave (8') and H for the high octave (4'). With three reeds in the
middle octave (upper and lower beating) MMM it is noted. With two reeds in the
middle octave and one in the low octave LMM is noted. Check if the sounding
reeds (when pressing one key) can be measured by the tuner at the same time. In
the “Tones” mode (“Octave” and “Chord” buttons both not pressed) 1, 2 or 3
reeds in the same note (M, MM or MMM) can be measured at the same time. In the
“Octaves” mode, 2 or 3 reeds of the same note, but in another octave (LM, MH,
LH or LMH) can be measured at the same time. If the accordion has more reeds
(for example LMM) then one must be eliminated become before starting measuring.
Set the number of reeds in the tuner to the number of sounding reeds.
This is done with the “Reeds” button.
A4 is frequently tuned to 440 Hz. If the desired pitch of the A4 must
remain the same as it was, then the frequency of the A4 of the accordion must
be measured first. Press the “Freq” button for this and sound the A4 of the
accordion. In the wide bottom window with the red needle(s) there are boxes
shown with the frequencies of the measured reeds now. Read the frequency and
set the A4 frequency on the tuner with the vertical slider on the right. From
now on the tuner uses the scale with the A4 on the desired frequency.
Record all keys (or buttons) with the “Record” button pressed. Record
all keys in the push direction and also in the pull direction.
Create (fill in) or load the beating list (click on the text below the
image of the accordion). Press the “Recorded” button to view the recorded
pitches. Now the beating list can be filled in in such a way that the graph
runs through the recorded values. Close the window with the beating list using
the red cross. The name of the beating list is now shown below the image of the
Go to “Record & Report” using the “Menu” button. The deviations of
the reeds in Cent are shown in the “Error” column. This is the amount that the
reeds need to be adjusted when the reed blocks are taken out of the accordion
later on. In fact only the error values of the first reed and the goal values
of the beatings are of importance. This will become clear in the next step. Now
print a “Tuning Report” using the “Report” button. Return to the main screen of
Get the reed blocks out of the accordion. Because of the changed
surroundings of the reeds the pitch of the reeds will change now. They are no
longer locked up in the case. Sound the reeds of one key on the tuning table.
Remember the deviation of the first reed. Look in the tuning report how much
the first reed needs to be adjusted (the “Error” value from the report).
Determine the desired deviation (= current deviation – error value from the
report) and tune the reed. The pitch of the reeds will be exactly right when
the reed blocks are placed back in the accordion and the case is closed. Now
tune the other reeds until the beatings are at the correct values. The tuner
shows this value according to the current beating list. The tuning report is
not needed for this. Repeat this for each note. All reeds are now tuned.
Place the reed blocks back in the accordion. Close the accordion and
record all the notes once again. All the reeds should be on the desired pitch
and the desired beatings now.