doc vox

DEVELOPING.md

@@ -36,8 +36,8 @@ Sai uses the following tokens:
 
 Sai has the following core components:
 
+- `vox`: target price feed
 - `tub`: CDP record store
-- `tip`: target price feed
 - `tap`: liquidation mechanism
 - `top`: global settlement facilitator
 
@@ -76,15 +76,22 @@ The reference price of `skr` is then given by the dynamic `tag`, e.g.
 the price of SKR in USD.
 
 
-### `tip`: Target Price Oracle
+### `vox`: Target Price Feed
 
-The `tip` is a simple oracle for the Sai *target price*, given in terms
-of the reference unit, by `par`. For example, `par == 2` with USD as
-the reference unit implies a target price of 2 USD per Sai.
+The `vox` provides the Sai *target price*, given in terms of the
+reference unit, by `par`. For example, `par == 2` with USD as the
+reference unit implies a target price of 2 USD per Sai.
 
 The target price can vary in time, at a rate given by `way`, which is
 the multiplicative rate of change per second.
 
+The `vox` is the same as that in Dai, but with the sensitivity, `how`,
+set to zero. Adjustments to the target price are made by adjusting the
+rate of change, `way`, directly with `coax`. In future Sai iterations,
+`how` may be non-zero and `way` adjustments will then follow
+automatically via the feedback mechanism. The `vox` component is subject
+to ongoing economic modelling research.
+
 
 ### `tub`: CDP Record Engine
 
@@ -98,7 +105,7 @@ The `tub` is the CDP record system.  An individual CDP is called a `cup`
 It is crucial to know whether a CDP is well collateralised or not:
 `safe(cup)` returns a boolean indicating this.
 
-`safe` aggregates price information from the `tip` and the `tub` and
+`safe` aggregates price information from the `vox` and the `tub` and
 compares the reference value of a CDPs debt and collateral.
 
 The following `tub` acts are not possible if they would transition a CDP
@@ -299,7 +306,6 @@ Script output gist
 ### Meme Mnemonics
 
 - `pip`: trading pips
-- `tip`: target price tip-off
 - `cup`: small container for CDP info
 - `tub`: larger container for cups
 - `tap`: liquidity provider