> ----- Original Message -----
> From: <weld@...>
> Ive had a day to digest my MOTM system.
> I must say Pauls designs and build is A-One!
You're preachin' to the choir. HA HA. That's why we keep buying and
bugging Paul about when the next module is coming out.
> He should win some kind of award!
He is rewarded with some loyal customers. And, I think his wife is getting
a new kitchen.
> One wish on the VCO, would be preset octave switches.
> I once had a 2600 modded with this and it was a nice addition.
> Anyone done this or have any thoughts ?
I have always loved octave switches. I have made a stand alone module for
my MOTM that does just that. In fact, it has not only octaves but other
musically useful intervals. However, it is strickly a DIY thing and not
available as a kit or constructed module. There are two ways to approach
this issue:
# 1 - I first thought about a VERY simple module with a rotary switch and
some resistors and some trimmers that would produce a voltage that could be
connected to one of the MOTM-300 FM inputs. As that voltage was switched,
it would add internally to the 300 VCO 1-volt-per-octave signal to give
octave or other interval switching.
However, my idea was frowned upone by those of greater minds and I was
convinced to do something a little better. Hence # 2.
# 2 - This modules adds two DC voltages VERY accurately. One voltage is the
1-volt-per-octave keyboaerd CV and the other is a voltage produced in the
module to produce octave or other musical intervals. The output of this
module feeds the 300 VCO or other VCOs to give you instantly switchable
octaves and intervals.
You cannot use a generic mixing module for this function because even very
small variations or errors in the keyboard CV result in audible pitch error.
I can send you the information about the circuit. I have one successfully
built on Paul's protoboard and it works fine. However, it is strictly DIY.
If you just got your MOTM and are enjoying it, that means you must have
purchased assembled modules. Many of us buy kits. The circuit I have for
octave shifting could not be recommended for someone brand new to building
electronics. It is not available as an assembled modules (unless you have
hundreds of dollars burning a hole in your pocket these days. I am not
cheap, but everyone has a price. HA HA).
Stooge Larry