From 3634059dcd924401ad8456c8db526c6eb0bee1db Mon Sep 17 00:00:00 2001
From: Andrew Belt <andrewpbelt@gmail.com>
Date: Wed, 20 Feb 2019 06:19:18 -0500
Subject: [PATCH] Revise Param documentation. Fix Param::getDisplayValue()
 formula for logarithmic bases.

---
 include/engine/Param.hpp  | 5 ++---
 src/app/ParamQuantity.cpp | 2 +-
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/include/engine/Param.hpp b/include/engine/Param.hpp
index abddd1e8..b7d50bc8 100644
--- a/include/engine/Param.hpp
+++ b/include/engine/Param.hpp
@@ -37,11 +37,10 @@ struct Param {
 	*/
 	std::string label;
 	/** The numerical unit of measurement appended to the value.
-	Use a space before non-abbreviations to separate the numerical value.
-	e.g. " semitones", "Hz", "%", "V"
+	Use a space before units to separate the numerical value from the number (e.g. " semitones", " Hz", " V"), unless the unit should have no space (e.g. "%", "º").
 	*/
 	std::string unit;
-	/** Set to 0 for linear, nonzero for exponential. */
+	/** Set to 0 for linear, positive for exponential, negative for logarithmic. */
 	float displayBase = 0.f;
 	float displayMultiplier = 1.f;
 	float displayOffset = 0.f;
diff --git a/src/app/ParamQuantity.cpp b/src/app/ParamQuantity.cpp
index a59f1661..026383b6 100644
--- a/src/app/ParamQuantity.cpp
+++ b/src/app/ParamQuantity.cpp
@@ -85,7 +85,7 @@ void ParamQuantity::setDisplayValue(float displayValue) {
 	}
 	else if (displayBase < 0.f) {
 		// Logarithmic
-		v = std::pow(displayBase, v);
+		v = std::pow(-displayBase, v);
 	}
 	else {
 		// Exponential