Gift for my brother...help!

[alparent]

OK I want to build an effect for my brother.
He plays harmonica and mandolin........he's really into southerner gospel and bluegrass....
Any idea on what kind of effect he might appreciate?

Thanks

[CynicalMan]

Ideas:
http://www.lonewolfblues.com/

[alparent]

I have a Rebote 2.5 in the works......
The Lone Wolf site says that the efect they sell is not a tone sucking modded guitar delay but a tone enhancing harp delay. The dry portion of the signal passes through a buffered input and high value coupling capacitors assuring maximum bass response. The echo portion passes through 5 low pass filters to provide maximum warmth. This is a digital delay that has all of the warmth of an analog delay and then some. 

I that just just marketing blabla or can I mod the Rebote 2.5 to be more harp friendly?

I get the blending in of the dry signal ...... but what's up with this 5 low pass filters?

[Mark Hammer]

If he amplifies his mandolin, he might appreciate some sort of in-line EQ for taming unwanted resonances.  If you were to use the same general design as a Phase 45, but without any sweep or JFETs (that is JUST a variable resistance to ground, provided by a dual-ganged pot, or by a 3-position DPDT), you can produce a notch.  Make 4 phase-shift stages with a DPDT for one pair, and a different DPDT for the other, combine the output of the phase-shift stages in a mixing stage (just like the Ross Phaser), and you have a dual notch filter.

I'm not at work today, but I'll be in tomorrow and show you in more detail what I mean.  It can easily fit in a small box, should be pretty quiet, run off 9v, and shouldn't take more than two quad op-amps to do.

[Mark Hammer]

Incidentally, Alain makes some lovely wooden-chassis lathe-turned pens.  He was gracious enough to give one to my wife this past weekend at our DIY get-together, for which she sends a very big appreciative Thank You.