Notes from the Workshop

A space for players interested in my specialist harmonicas, alternate tunings, instructional material, recordings etc to ask questions and share information, experiences, videos etc.
Roverharp
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Joined: Thu Apr 06, 2017 4:10 pm

Re: Notes from the Workshop

Post by Roverharp » Sun Jul 19, 2020 3:37 am

Haha. Looks like the same problem i’ve been having with my own designs. So, there are partitions build into the cover plates? I think those can cause a problem but one different than what you you mentioned. Let’s deal with that first.

In my experience the restricted sound is down to the air being routed out the rear of the harp. I’ve built some harps that didn’t have cover partitions but did have porting out the back. I also noted such a sound. Seems the more robust sound comes from directly over the slot as the reed swing through it. When this is prevented the air seeks another point of exit. Routing it to rear ports does work; just not as rich sounding as the point where the sound is generated.

The main issue with placing partitions is that it can sometimes cause ‘de-coupling’ of the reeds used in a bend. Instead of working together it becomes difficult to hold a bend and both reeds go off squealing in opposite directions. This is pretty common in the Suzuki Overdrive. Bent notes occur as an interaction between reeds. (Even reeds in addition to the two reeds in a chamber seems to offer more stable bends).


Brendan, if you like let’s pow-wow this week. I should have something to show for the design experiments i’ve been trying. Also lots of hiccups that you can help resolve :)
Last edited by Roverharp on Sun Jul 19, 2020 12:22 pm, edited 1 time in total.

Roverharp
Posts: 12
Joined: Thu Apr 06, 2017 4:10 pm

Re: Notes from the Workshop

Post by Roverharp » Sun Jul 19, 2020 8:04 am

Double post
Last edited by Roverharp on Sun Jul 19, 2020 12:21 pm, edited 4 times in total.

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Brendan
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Re: Notes from the Workshop

Post by Brendan » Sun Jul 19, 2020 9:10 am

Yes, there are some mysterious effects going on as soon as you match reeds and channels with your oral cavity, whether before or after the reed.

Looking forward to chatting later this week Paul :)

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triona
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Location: Aue / Germany

Re: Notes from the Workshop

Post by triona » Wed Jul 22, 2020 11:50 pm

One more interesting idea from long ago by Cham-Ber Huang:
https://www.chamberhuang.com/cbh2016.html
It seems to be related with this to some degree. I did not yet understand the construction fully. But at least the slide seems to be on the back of the harmonica as well.


dear greetings
triona
Aw, Thou beloved, do hearken to the Banshee's lonely croon!
sinn féin - ça ira !
Cad é sin do'n té sin nach mbaineann sin dó


https://www.youtube.com/channel/UC1yI3H ... 9ktgzTR2qg

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Brendan
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Re: Notes from the Workshop

Post by Brendan » Sat Jul 25, 2020 5:43 am

Thanks Triona. The CBH16 is a famous and highly innovative chromatic harmonica, albeit with some curious flaws (long distance to the reeds being the main one). If does have a clever and unique slide system, but the slide is on the front of the instrument.

They have not been made for a long time, but are still highly sought after by some players. Robert Bonfiglio is the best known CBH16 player: he uses them exclusively.

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