diff --git a/TODO b/TODO
index 3b78934..2abe9da 100644
--- a/TODO
+++ b/TODO
@@ -6,7 +6,6 @@ code:
 * check all examples again
 * osc post filter (and one pole init, slew rate, etc.) val from input? set state instead?
 * audio rate optional pulse width/slope inputs?
-* one pole process const input? (return also if const out)
 * empty functions etc. to keep consistency and forward compatibility?
 * float in [-1,1] for velocity, pitch bend, mod wheel
 * should clip slope in triangle?
@@ -25,7 +24,6 @@ code:
 * bw_fuzz gain compensation?
 * make gain of distortions homogeneous?
 * max_delay -> set sample rate? see reverb
-* update state ctrl -> process ctrl?
 * mem req -> return value of set sample rate?
 * peak gain + Q ???
 * sr_reduce reset_coeffs? update_coeffs? process_multi?
@@ -71,6 +69,7 @@ code:
 * any chance to avoid casts in C for const X * const * input arguments?
 * heavy debug (e.g. also stripping restrict) vs light debug vs release vs optimized makefile rules
 * smaller optimized modules (e.g., simple one pole)
+* one pole, slew lim, maybe others: process const input? (return also if const out)
 
 build system:
 * make makefiles handle paths with spaces etc
diff --git a/include/bw_env_gen.h b/include/bw_env_gen.h
index 1c965f7..36abfba 100644
--- a/include/bw_env_gen.h
+++ b/include/bw_env_gen.h
@@ -42,6 +42,8 @@
  *    <ul>
  *      <li>Version <strong>1.0.0</strong>:
  *        <ul>
+ *          <li>Renamed <code>bw_env_gen_update_state_ctrl()</code> as
+ *              <code>bw_env_gen_process_ctrl()</code>.</li>
  *          <li><code>bw_env_gen_process()</code> and
  *              <code>bw_env_gen_process_multi()</code> now use
  *              <code>size_t</code> to count samples and channels.</li>
@@ -168,9 +170,9 @@ static inline void bw_env_gen_update_coeffs_audio(bw_env_gen_coeffs *BW_RESTRICT
 /*! <<<```
  *    Triggers audio-rate update of coefficients in `coeffs`.
  *
- *    #### bw_env_gen_update_state_ctrl()
+ *    #### bw_env_gen_process_ctrl()
  *  ```>>> */
-static inline void bw_env_gen_update_state_ctrl(const bw_env_gen_coeffs *BW_RESTRICT coeffs, bw_env_gen_state *BW_RESTRICT state, char gate);
+static inline void bw_env_gen_process_ctrl(const bw_env_gen_coeffs *BW_RESTRICT coeffs, bw_env_gen_state *BW_RESTRICT state, char gate);
 /*! <<<```
  *    Triggers control-rate update of the internal `state` using `coeffs` and
  *    the given `gate` value (`0` for off, non-`0` for on).
@@ -342,7 +344,7 @@ static inline void bw_env_gen_update_coeffs_audio(bw_env_gen_coeffs *BW_RESTRICT
 	(void)coeffs;
 }
 
-static inline void bw_env_gen_update_state_ctrl(const bw_env_gen_coeffs *BW_RESTRICT coeffs, bw_env_gen_state *BW_RESTRICT state, char gate) {
+static inline void bw_env_gen_process_ctrl(const bw_env_gen_coeffs *BW_RESTRICT coeffs, bw_env_gen_state *BW_RESTRICT state, char gate) {
 	(void)coeffs;
 	if (gate) {
 		if (state->phase == bw_env_gen_phase_off || state->phase == bw_env_gen_phase_release)
@@ -391,7 +393,7 @@ static inline float bw_env_gen_process1(const bw_env_gen_coeffs *BW_RESTRICT coe
 
 static inline void bw_env_gen_process(bw_env_gen_coeffs *BW_RESTRICT coeffs, bw_env_gen_state *BW_RESTRICT state, char gate, float *BW_RESTRICT y, size_t n_samples) {
 	bw_env_gen_update_coeffs_ctrl(coeffs);
-	bw_env_gen_update_state_ctrl(coeffs, state, gate);
+	bw_env_gen_process_ctrl(coeffs, state, gate);
 	if (y != NULL)
 		for (size_t i = 0; i < n_samples; i++)
 			y[i] = bw_env_gen_process1(coeffs, state);
@@ -403,7 +405,7 @@ static inline void bw_env_gen_process(bw_env_gen_coeffs *BW_RESTRICT coeffs, bw_
 static inline void bw_env_gen_process_multi(bw_env_gen_coeffs *BW_RESTRICT coeffs, bw_env_gen_state *BW_RESTRICT const *BW_RESTRICT state, const char *BW_RESTRICT gate, float *BW_RESTRICT const *BW_RESTRICT y, size_t n_channels, size_t n_samples) {
 	bw_env_gen_update_coeffs_ctrl(coeffs);
 	for (size_t j = 0; j < n_channels; j++)
-		bw_env_gen_update_state_ctrl(coeffs, state[j], gate[j]);
+		bw_env_gen_process_ctrl(coeffs, state[j], gate[j]);
 	if (y != NULL)
 		for (size_t i = 0; i < n_samples; i++)
 			for (size_t j = 0; j < n_channels; j++) {