More Questions.

[Reverend bluE]

Okay.   I have a VCO chip, and a schematic for a logarithmic amplifier.

The chip is the (Phillips) ECG864 Precision Waveform Generator.
It's a 14pin DIP  the pin-outs are as follows:
1  SINE WAV ADJ
2  SINE WAV OUT
3  TRIANGLE OUT
4,5  DUTY CYCLE FREQUENCY ADJ
6  V+
7  FM BIAS
8  FM/SWEEP INPUT
9  SQUARE WAVE OUT
10  TIMING CAP
11  V-/GROUND
12  SINE WAVE ADJ
13  NC
14  NC

As far as I can tell, this is a linear VCO (true/false?), but I can get them
from TechAmerica (right down the street from me) for 4-5 dollars.  

I was wondering if this chip would work in a synth design.  I would plan to
use it with the logarithmic amplifier design from "The Master Handbook of IC
Circuit Applications 3rd Edition" by Delton T. Horn.
Sorry for the crudeness, but this is my first try at ascii-matics...
		
			   0.1
		|------|---||---|-----|
		|      |        |     |
		|      |---|<---|     |
		|         1N914       |
		|		      |
		|-------[2N2222]------|
		|		      |
Vin	100k	|   2	|---V+        |
-------/\/\/----|----|\ |	      |
		     | \|7	      |	
		     |  \ 6	      |    Vout
		    3|   \____________|________
		|----|741/   	      
		|    |  /4|
		|    | /  |
		|    |/2| |--|
	        \   1|  |    |
	     82k/    \  |-|  |
		\    /330 |  |
		/    \    |  |
		|    /    |  |
		|    |10k |  |
	      -----  -/\/\-  |
	       ---      ^    |
		-       |    |
			|----|
			|
		       -V


Now, I expect that this will take my Keyboard voltage (which is linear) and
make it logarithmic so I can have a 1v/Octave synth.  Is this true?  

Or...should I just give up on these, and order some decent "music" chips?

thanks in advance... 
-ben