Łukasz Martynowicz

He’s active on facebook concertina groups, you can try there. And I can very much recommend his Haydens - I helped him develop them He is currently working on extending the range of his Bandotin down to F2 (current iteration goes down only to A2, which is greatly limiting accompaniment capabilities).

As to my personal slant/no slant preference. I have a couple of years of slanted experience on Elise vs current no slant 66b and I vastly prefer no slant. Especially on RH, where it greatly increases pinky usability. Overall ease of navigation is also increased due to symmetrical vertical alignment of rows.

Apart from the difference in fingering, mirrored layout also changes bellows behaviour, so there is that to consider. As to my to-be instrument: 6 1/4 or 6 1/3”, square, 3D printed, harmonikas.cz brass DIX reeds (accordion style), probably three options - 40, 46 and 50b in the same box (upgradeable later on). 40b version will have RH Troubadour layout and the same repeated for the LH (octave lower of course), 46 is „standard” and 50 will extend the standard down to Bb key (however, there will be mixed Eb/D# positions due to lever routing restrictions in such a small box, so it won’t be easy-peasy key). No slant, non-mirrored (however mirrored could probably be made to order, as it doesn’t require any layout redesign). Prices yet to be established, but somewhere between Stagi and Troubadour probably.

There will be no slant if that is what you ask. Original Wicki layout also had mirrored fingering.

If you're not in too much hurry, I may be releasing 40-50b 3D printed Hayden later this year (late fall probably). The higher button count variant will cover similar range as Beaumont.

Waiting for the reeds to arrive I started renovating my workshop and it prooved more labourous than I thought (115 years old building is full of surprises). The concept phase is done however, I just can’t start printing it for another month or so. But while my schedule is delayed, my goal stands firm.

I’m really interested in hearing what you came up with, as this piece covers pretty much an entire range of my 66b. Even the melody part stretches over the whole RH… You should hovever be able to play the third part in full IIRC. Given it is similar to the first part, you can skip the range problem by playing the end of the third part in place of the ending of the first part. I sometimes do this by mistake if I’m not focussed enough. There is no way however to play the middle part on anything smaller than 46 „standard” and it still requires crossing to the LH with the melody.

There is always an option to be "bilingual"

As you probably figured out by now, playing on a Hayden is all about geometry, not note names. So if you decipher the series of finger movements in one key, the same series of finger movements apply in any other key. If you’re just beginning learning dots you may want to look at a specific alternative notation system, Parncut 6-6 Tetragram. It has a „built in” reference to Hayden rows layout and is way easier to sight read than traditional dots.

Why exactly you need any written transposition to transpose on a Hayden? Simply „relabel” buttons mentally to „shift” the layout to a desired key and play. Geometry of the music stays the same, unless you’re aiming at a „wrap around” key. This is one of the main features of all isomorphic layouts.

Well, I’ve designed unique handles if that counts. The benefit is decoupling the wrist while retaining bellows control, and anchoring the hand firmly, so I don’t get lost on 66b Hayden. I never got along with hand straps, as I have really long fingers.

Given the goal of this excercise, I would skip it entirely. As Alex wrote, replacing accordion style reedpan for flat mounted one means you have to replace entire interior. With your listed workshop capabilities, I would save only the bellows and made entire new endboxes+innards from scratch. This way you can continue to play this instrument while you’re building the new one. You then switch the bellows and reeds to the new one and start building yet another instrument. This time around entirely from scratch and less bad, since you will now have enough knowledge about concertina building basics, to at least know what you are doing An old quote from the first Matrix movie is very adequate here: „Everybody fails the first time”

It is basically a guitar version of a Janko piano layout, with just a slight skew of the unisons line. This layout is very straightforward to play on for Hayden player. I've recently designed a 3D printable piano-to-Janko conversion set for M-Audio digital piano, and I think I might look into expanding to Harpeji next

My guess would be, that either reed frames are made from aluminum instead of traditional zinc, and/or that they are in individual frames instead of on common plate. Didie, do you know what reeds are installed in your bandotin?

I can recommend Harmonikas, especially their DIX range, which not only sound great, but are also easier to work with than italian reeds, as they are slightly shorter but also slightly wider for the same size, so can have larger clearance between the inner valve and the chamber wall. They do sell single sets and even single reeds. They also do have „concertina” range, though those are semi-traditional only, as they still have accordion style trapezoid tongues. However, their current lead time is around 12 weeks.